CHAPTER 340
WEIGHTS AND MEASURES ACT

[SUBSIDIARY LEGISLATION]

INDEX TO SUBSIDIARY LEGISLATION

   OMITTED NOTICES

   ORDERS

      The Metric System (Clothing Material) Order

      The Metric System (Enforcement) Order

      Omitted Orders

   REGULATIONS

      The Weights and Measures Regulations

      The Weights and Measures (Fixed Storage Tank) Regulations

      The Weights and Measures (Sand and Other Ballast) Regulations

      The Weights and Measures (Packed Goods) Regulations

OMITTED NOTICES

(Section 19(1))

   The following Notices have been omitted:

G.N. No. 127 of 1998

The Assizing (Manyoni District : Itigi, Manyoni, Kilimatinde and Kitinku Divisions only) Order.

G.N. No. 61 of 1990

The Assizing (Singida Township) Order.

G.N. No. 430 of 1991

The Assizing (Singida Township) Order.

ORDERS

THE METRIC SYSTEM (CLOTHING MATERIAL) ORDER

(Section 3)

G.N. No. 278 of 1969

   1. This Order may be cited as the Metric System (Clothing Material) Order, and shall come into operation with effect from 1st December, 1969.

   2. It is hereby declared that the weights, measures and instrument employed to weigh or measure any kind of cloth or any kind of material ordinarily used in making articles or clothing (whether or not such cloth or material is sold or offered for sale for the purpose of making articles of clothing) shall from the date on which this Order comes into operation be in accordance with the metric system.

THE METRIC SYSTEM (ENFORCEMENT) ORDER

(Section 3)

G.N. No. 225 of 1969

   1. This Order may be cited as the Metric System (Enforcement) Order.

   2. In this Order, unless the context otherwise requires–

   "dealing" means sale, purchase or barter;

   "effective date" in relation to any area specified in the first column of the First Schedule to this Order means the date specified opposite thereto in the second column of the said Schedule;

   "specified area" means an area specified in the first column of the First Schedule to this Order.

   3. Every specified area is hereby declared to be the area in which with effect from the effective date, weights, measures and instruments employed to weigh or measure in respect of the trades specified in the Second Schedule to this Order shall be in accordance with the metric system.

   4. This Order shall not apply to dealings in any article imported from outside Tanzania or acquired from a manufacturer in Tanzania prior to the effective date in a package (including tin) and purchased sold or otherwise disposed of in its original packing.

FIRST SCHEDULE

FIRST COLUMN

SECOND COLUMN

Coast Region

8th September, 1969

Morogoro Region

1st October, 1969

Tanga Region

1st November, 1969

Mwanza Region

1st December, 1969

Mara Region

1st December, 1969

Dodoma Region

1st January, 1970

Singida Region

1st January 1970

Kilimanjaro Region

1st February, 1970

Arusha Region

1st February, 1970

Shinyanga Region

1st March, 1970

Tabora Region

1st March, 1970

Kigoma Region

1st March, 1970

Mbeya Region

1st March, 1970

Iringa Region

1st March, 1970

Kagera Region

1st April, 1970

Mtwara Region

1st July, 1970

Ruvuma Region

1st July, 1970

SECOND SCHEDULE

1.   Dealings in meat, offal, poultry and other articles, commonly sold by butchers.

2.   Dealings in bread, bread rolls, cakes and other articles commonly manufactured at a bakery.

3.   Dealings in wheat, wheat flour, rice, rice flour, maize, maize flour, groundnuts, cotton, coffee, tea, sugar, livestock, beans, potatoes, onions, lentils, peas, millet flour, fruits and vegetables.

4.   Dealings in clothing material whether of cotton, silk or any other material.

OMITTED ORDERS

(Section 4)

   The following Orders have been omitted:

G.N. No. 58 of 1970

The Metric System (Cotton) (Exemption) Order.

G.N. No. 167 of 1971

The Metric System (Cotton) (Exemption) Order.

REGULATIONS

THE WEIGHTS AND MEASURES REGULATIONS

(Section 54)

G.Ns. Nos.
339 of 1960
363 of 1960
394 of 1963
329 of 1966
112 of 1979
147 of 1981
188 of 1993
614 of 1995
128 of 1996
536 of 1998
537 of 1998

PRELIMINARY PROVISIONS (regs 1-2)

1.   Short title

   These Regulations may be cited as the Weights and Measures Regulations.

2.   Interpretation

   In these Regulations, unless the context otherwise requires–

   "Act" means the Weights and Measures Act;

"calibration" means the set of operations to determine the capacity of a tank, up to one or several filling levels, whether marked or not;

   "calibration table (calibration chart)" means the expression, in the form of a table, of the mathematical function V(h) which represents the relation between the height "h" (independent variable) and volume "V" (dependent variable);

   "capacity" in reference to a weighing instrument means the maximum load it is constructed to weigh, as marked or indicated on the instrument in accordance with the Act or these Regulations;

   "error" in reference to an instrument includes deficiency in sensitiveness;

   "expansion volume" means the difference between total contents and nominal capacity;

   "instrument" means any weighing or measuring instrument;

   "just" in reference to a weight, measure or instrument means that it has not a greater error than the limit of error specified in the Tables annexed hereto;

   "nominal capacity" means the volume of liquid which a tank contains under rated operations, at reference temperature;

   "rail or road tank" means a container, which may or may not be subdivided into two or more compartments, mounted on a wagon or motor truck, and used for the sale or delivery, by measures of capacity, of paraffin, fuel, oil, petrol, or petrol substitutes. When a rail or road tank is subdivided the term "compartment" means any one of the subdivided portions of the rank;

   "reference height (H)" means the distance, measured along the vertical measurement axis, between the reference point and the foot of the vertical measurement axis, on the inner surface of the tank, or on the dip plate;

   "reference point (P)" means the distance, measured along the vertical measurement axis, between the reference point and the foot of the vertical measurement axis, on the inner surface of the tank, or on the dip plate;

   "rejected" in reference to a weight, measure or instrument means any weight, measure or instrument examined by an inspector and found not to comply with the requirements of the Act or any regulations made thereunder;

   "repaired" in reference to a weight, measure or instrument means any weight, measure or instrument which since it was last stamped has had some adjustment, other than balancing in the case of a weighing instrument, made to any of its vital parts;

   "sensitivity of a tank in the vicinity of a filling level h" means the change in the level 0 0 Ah/ for the contained volume corresponding to the level;

   "stamping station" means any place appointed by an inspector pursuant to section 28(1) of the Act;

   "total contents" means the maximum volume of liquid which a tank may contain up to overflowing, underrated operating conditions, at reference temperature;

   "ullage height (C)" means the distance between the free surface of the liquid and the reference point, measured along the vertical measurement axis;

   "vertical measurement axis" means the vertical line on which the levels of liquid are gauged.

CARE AND CUSTODY OF STANDARDS (regs 3-4)

3.   Verification of secondary standards

   (1) The accuracy of the secondary standards shall be verified at least once in every two years by comparison with the National standards. An inspector shall verify the accuracy of such comparison in the presence of the wardens of the National standards who shall then authenticate the secondary standards by the issue to the inspector of a certificate in Form A set out in the First Schedule hereto.

Verification of working standards

   (2) The accuracy of the working standards shall be verified at least once in every twelve months by an inspector by comparison with the secondary standards. The inspector shall authenticate them by the issue of a certificate in Form B set out in the First Schedule hereto.

4.   Examination of National standards

   The Principal Secretary shall, at least once in each quarter, instruct an inspector to make a careful examination of all the National standards and instruments with a view to seeing that they are complete, clean and in a good condition, and the inspector shall on each occasion enter a note thereof in a "Record of Standards" book, in Form C set out in the First Schedule hereto and that such examination and record shall be made in the presence of the wardens of the standards.

VERIFICATION (regs 5-16)

5.   Design of stamp of verification

   The inspector shall stamp all just weights, measures and instruments with the stamp of verification of the following uniform design with the addition of a number or mark distinguishing the inspector by whom it is used–

6.   Date marks

   The following letters shall indicate the months opposite them and, whenever possible, the appropriate letters shall be stamped in addition to the stamp of verification to indicate the month in which the verification mark is placed on the weight, measure or instrument by an inspector–

A JanuaryD AprilG JulyJ October
B FebruaryE MayH AugustK November
C MarchF JuneI SeptemberL December

Whenever possible, the year of stamping shall also be indicated by stamping the last two figures of the year, thus the year 1960 shall be shown as "60".

7.   Obliterating stamps

   (1) The stamp of verification on a weight, measure or instrument shall be obliterated only by means of a stamp of the following six-pointed star design–

and any weight, measure or instrument bearing such obliteration shall, for all the purposes of the Act and any regulations made thereunder, be deemed to be unstamped.

   (2) Where any instrument is required to be stamped or sealed on more than one place, the obliteration of any one stamp of the breaking of any one seal or sealing device shall render the instrument unstamped.

8.   Examination on dealers' premises

   Weights, measures and instruments may be examined on the premises of a repairer or dealer therein:

   Provided that the travelling expenses of the inspector and the cost of transport of standards and equipment be paid by the repairer or dealer in addition to the prescribed verification fee.

9.   Duties of persons submitting

   The inspector may require any person submitting any weight, measure or instrument for examination–

   (a)   to take it apart to such an extent as to enable him to examine the working parts; and

   (b)   to provide sufficient labour for the proper and expeditious handling of the standards or any material which is to be used in the testing of any such weight, measure or instrument.

10.   Weights, etc., to be clean when presented

   All weight, measures or instruments shall be tested in a clean condition and, if necessary, the inspector may call upon the owner or user to clean them, and failing compliance he may make a charge for such cleaning of a sum equal to the charge for stamping any weight or measure of a similar denomination.

11.   Testing procedure

   Before stamping any weight, measure or instrument the inspector shall ascertain that it complies with the requirements of the Act and these Regulations.

12.   Authority to re-seal after repair, etc.

   An inspect may authorise any fit and proper person employed bona fide in the erection, repair and adjustment of instruments defined as liquid measuring pumps in regulation 146 hereof to break any seal or sealing device on any such instrument which he intends to erect, repair or adjust and to seal or re-seal the same subject to the following conditions–

   (a)   an inspector may withdraw any such authorisation at any time;

   (b)   the person authorised shall be provided with stamped testing measures of a pattern approved by the inspector and shall test each instrument for accuracy before sealing or re-sealing;

   (c)   the person authorised shall seal or re-seal an instrument only by means of stamping pliers so constructed as to impress upon every seal or sealing device such mark and number as the inspector may allot to him for the purpose of identification;

   (d)   the person authorised shall forward at once to the inspector a notice in writing in Form D set out in the First Schedule hereto reporting every such sealing or re-sealing;

   (e)   within twenty four hours of such sealing or re-sealing the owner or user of the instrument shall send to an inspector a request in writing to verify the instrument.

13.   Use of liquid fuel, etc.

   An inspector may at any time withdraw any liquid fuel or lubricating oil from a measuring instrument for the purpose of testing such instrument. Any liquid fuel or lubricating oil so withdrawn shall be returned forthwith to the tank or container and the inspector shall, if requested by the person in charge of the instrument, furnish to such a Weights and Measures person a written statement of the quantity so withdrawn.

14.   Weights, etc., not admitted

   An inspector shall not admit for verification any weight, measure, weighing instrument, measuring instrument or price computing instrument which–

   (a)   is not complete in itself; or

   (b)   bears any mark which might be mistaken for a stamp of verification; or

   (c)   is not sufficiently strong to withstand the ordinary wear and tear of use in trade; or

   (d)   has removable parts, the removal of which would affect its accuracy unless the parts are such that the weight, measure or instrument cannot be used without them; or

   (e)   has reversible or interchangeable parts, the reversal or interchange of which would affect its accuracy unless such parts are clearly and indelibly marked to indicate their position; or

   (f)   is not properly constructed, or when, in his opinion, it appears to be of a pattern which might facilitate the perpetration of fraud.

15.   Abbreviations

   The denomination of a weight or measure, or the capacity of an instrument, if not marked in full, shall be indicated only by one of the abbreviations specified in the Second Schedule hereto.

16.   Form prescribed for purposes of section 32 of R.L. Cap. 426

   In exercise of the powers vested in him by the proviso to section 32 of the Act, the Chief Inspector shall use Form E in the First Schedule.

WEIGHTS (regs 17-23)

17.   Material

   Examination. – All weights shall be made of some metal other than lead, except where lead is inserted for the purpose of adjustment. Weights made of soft metals and soft alloys, e.g. tin or solder, shall not be permitted. Avoirdupois weights shall not be made of aluminium or other metals or alloys of low density. Cased weights and weights composed of two or more different unalloyed metals shall not be permitted.

18.   Denomination

   If the maker's name appears on the weight it shall be in letters not exceeding half the size of the letters indicating the denomination.

   Weights other than apothecaries weights shall not be marked with more than one denomination.

19.   Flaws

   All weights shall be free from flaws and cavities and shall be quite smooth on all surfaces.

20.   Mode of adjusting

   Avoirdupois weights of one ounce and over shall be provided with one adjusting hole only, which shall be on the under surface of the weight and shall not extend to the upper surface. The hole shall be undercut and plugged with lead which shall cover the bottom of the hole and be of sufficient thickness to ensure that it will remain securely in position. The approximate minimum distance of lead from the surface when new shall be one-fifth of the centre thickness of the weight.

21.   Shape

   Avoirdupois weights of iron shall be either flat-circular, bar, bell or ring weights, but 50 lb., 20 lb., 10 lb., and 5 lb. weights shall be of octagonal form.

   Iron weights of flat shape shall only be made from 4 lb. to 4 oz. inclusive. No iron weight under 4 oz. shall be stamped.

   Avoirdupois weights, other than iron weights, shall be flat-circular, bar or bell shaped, but 50 lb., 20 lb., 10 lb., and 5 lb. weights shall be of octagonal form. Flat weights shall only be stamped from 4 lb. to 1/2 dram inclusive.

22.   Permissible errors

   The errors permissible on the verification of weights shall be as specified in Tables I and II contained in the Third Schedule to these Regulations.

23.   Mode of stamping

   Stamping. – Weights provided with an adjusting hole shall be stamped on the lead in the adjusting hole. Weights not provided with an adjusting hole shall be stamped on the under surface.

MEASURES OF LENGTH (regs 24-27)

24.   Material and construction

   Examination. – Measures of length shall be made of steel, brass, ivory, hard wood, woven tape or other material that may be approved by an inspector. They shall be examined with the object of discovering any want of straightness and strength; and they shall be denominated and graduated clearly and indelibly. Wooden measures of two feet or more in length shall have both ends capped with metal and the caps shall be riveted. In measures such as those used for measuring bales, timber, etc., any sliding or caliper arms shall have no more play than is necessary for easy movement.

   A subdivided measure of length shall have its numbered divisions and also their subdivisions of longer lines than the minor graduations.

25.   Tension for linked and tape measures

   Verification. – Linked riband and tape measures shall be tested when subjected to a tension or pull as follows–

Ordinary riband or tape measures2 lb.
Metal riband or tape measures10 lb.
Linked measures15 lb.

The measure under test shall be supported throughout its whole length on a plane and even surface.

26.   Permissible errors

   The errors permissible on the verification of measures of length shall be as specified in Table IV contained in the Third Schedule to these Regulations.

27.   Position of stamping

   Stamping. – Measures of length shall be stamped near the beginning of the scale on each graduated side. In the case of linked measures the stamp may be placed on a metal label or disc permanently attached to the measure, or on the brass handle.

MEASURES OF CAPACITY (regs 28-42)

28.   Material and construction

   Examination. – Measures of capacity shall be made of glass, earthenware, tin, tin alloys, pewter, brass, bronze, copper, tinplate, white metal, aluminium, nickel, nickelled or nickel-plated steel or sheet iron, enamelled metal or other material approved by an inspector.

   Measures of brass, bronze or copper shall be well tinned all over the inside.

   The coating of nickel on nickelled measures shall be uniform and show no sign of peeling.

   Where there are strengthening ribs or bands they shall not take such a form as to show, by indentation or otherwise, divisions inside the measure, which might be mistaken for graduations.

29.   Lips or retaining edges

   In measures fitted with a lip or retaining edge the capacity defining line shall be sharp and regular. The lip or retaining edge of a measure shall not increase the capacity by more than ten percent of the marked capacity of the measure.

False bottom prohibited

   A measure which is not completely emptied when tilted to an angle of 120 degrees from the vertical shall not be stamped.

30.   Publican's measure

   A publican's metal, glass or earthenware measure shall be provided with a spout or projecting mouth and may also have a bottom rim. In measures of a pint and under, such rim shall not project more than half an inch below the bottom of the measure.

31.   Dipping measures

   A metal dipping measure of a capacity not exceeding half a gallon, used for the sale of milk, shall be of circular or elliptical section with vertical sides. The height shall not differ by more than ten percent from one-and-a-half times the mean diameter of the section.

32.   Taps

   A measure fitted with a tap shall not be permitted unless the measure can be completely emptied through the tap without tilting.

33.   Glass measures

   A glass measure shall not be permitted unless the capacity is defined either–

   (a)   by the brim of the measure; or

   (b)   by a line at least two inches in length, distant not less than half an inch nor more than one-and-a-half inches from the brim.

For subdivided glass measures of a gallon and under, other than apothecaries measures, the subdivisions shall be defined by lines at least one inch in length.

34.   Earthenware

   An earthenware measure shall not be measures permitted unless the capacity is defined by the brim, or by an indelible line marked on the inside of the measure, so that the distance of the bottom of the line from the brim does not Weights and Measures exceed three-eighths of an inch on measures of a quart and under and three-quarters of an inch on measures of higher capacities.

35.   Temperature compensators

   Where a measure of capacity is provided with a temperature compensator, a graduated scale shall be fitted indicating "plus" and "minus" either side of zero. A suitable thermometer and hydrometer shall be always available to enable the operator to adjust the compensator when necessary.

36.   Subdivided metal measures

   The subdivisions of metal measures of a capacity not exceeding a gallon is not permitted. In a subdivided metal milk measure of a capacity exceeding half a gallon there shall be two graduated metal strips or series of tablets fixed opposite each other inside, extending the whole depth of the measure and securely soldered on the measure. The graduations shall be marked in sharply incised lines.

37.   Denomination

   Every measure of capacity shall have its denomination clearly, permanently and indelibly marked on the outside of the body thereof and not upon the handle, bottom, rim or edges. On a glass measure in which the capacity is defined by a line, the denomination shall be marked at the line. On an enamelled metal measure the denomination shall be marked Weights and Measures in a distinctly different colour from that of the body of the measure. On all subdivided measures the denominations shall be marked on the graduated strips or on the tablets as well as on the outside.

38.   Apothecaries measures

   Apothecaries measures may be of cylindrical or conical form.

   A glass measure in which the subdivisions are less than one-twelfth of an inch apart shall not be permitted.

   A measure also marked with equivalents in weight may be permitted provided that the words "of water" are marked on the outside in addition to the denomination.

39.   Method of testing

   Verification. – Every measure shall be tested by filling the standard with water and emptying the contents into the measure submitted for verification.

   Where the capacity is indicated by a line, the measure shall be tested to the bottom of the line.

   A measure provided with a lip or retaining edge shall be tested to the bottom of the lip or retaining edge.

40.   Meniscus

   In testing a glass measure, the capacity of which is not defined by the brim, the level of water shall be taken at the bottom of the meniscus.

41.   Permissible errors

   The errors permissible on the verification of measures of capacity and apothecaries measures shall be as specified in Tables IV and V, contained in the Third Schedule to these Regulations.

42.   Method of stamping

   Stamping. – The stamp of verification shall, in the case of glass, earthenware and enamelled metal measures, be etched or sand blasted beneath or near the denomination. In metal measures, other than lip or rimmed measures, it shall be placed near the denomination. In metal measures provided with a lip or retaining edge it shall be placed on the bottom of the inside of the lip or retaining edge. Graduated metal measures shall be stamped on a solder stud affixed to the inside strip or tablet near to the top graduation and on the outside of the measure near the denomination.

   On sheet metal measures a solder stud shall be provided to receive the stamp of verification.

WEIGHING INSTRUMENTS (regs 43-57)

43.   Instruments not permitted

   No weighing instrument shall be permitted which has–

   (a)   a broken scoop, pan or plate; or

   (b)   a china plate which is chipped, cracked or porous to such an extent that it has become readily absorbent; or

   (c)   counterpoise weights representing a greater or less weight than the marked capacity of the instrument.

44.   Prohibition of certain types

   The following shall not be permitted for verification–

   (a)   weighing instruments known as "union scales";

   (b)   weighing instruments known as "decimal scales" or "bascules"; and

   (c)   micrometer scales, unless of a pattern approved by the Board of Trade under section 6 of the Imperial Weights and Measures Act, 1904.

45.   Marking of weighing capacity

   The weighing capacity of a weighing instrument shall be prominently and indelibly marked on the instrument. In dial machines fitted with a supplementary weigh bar, the full capacity shall be marked on some prominent part of the machine.

46.   Material

   All beams, steelyards, levers, rods, links, legs and stays shall be constructed entirely of metal.

47.   Knife edges and bearings

   Knife edges and bearings shall be of hard steel or a gate or other material approved by the Chief Inspector of Weights and Measures and shall be so fitted as to allow the beam or steelyard to move easily. All knife edges shall bear practically upon the whole length of their working parts and shall be so fitted that they cannot twist or otherwise get out of alignment. If a smooth file, when passed over a knife edge or bearing surface, fails to scratch it the knife edge or bearing shall be deemed to be hard.

48.   Graduations

   The graduations on all steelyards shall consist of notches or sharply incised lines so defined that the position of all sliding poises shall be clearly indicated. The indications on the dials of platform machines or weighbridges may be indelibly marked thereon by fine lines.

49.   Plug for verification stamp

   In every weighing instrument a lead plug for receiving the stamp of verification shall be inserted in an easily accessible part of the instrument. The hole shall be undercut and the face of the plug flush with the metal part in which it is inserted.

50.   Loose counterpoise and travelling poise

   No weighing instrument having loose counterpoise weights shall be permitted unless such counterpoise weights have one undercut adjusting hole only, containing sufficient lead to cover the bottom of the hole. Loose material shall not be permitted in or on a travelling poise.

51.   Special trades

   Weighing instruments used for weighing the following articles shall be beam scales of either Class A or Class B as defined in regulation 59 hereof–

   (a)   precious metals;

   (b)   precious stones;

   (c)   chemicals;

   (d)   drugs.

52.   Position when testing

   Movable instruments provided with a base shall be tested on a level plane. Instruments which are suspended in use shall be suspended when tested.

53.   Test at maximum load and tests for sensitiveness

   A weighing instrument shall be tested as far as practicable with its maximum load. A weighing instrument of the vibrating type shall be tested for sensitiveness by loading it with its maximum load with the beam or steelyard in a horizontal position and ascertaining that it turns with the addition of the amount shown in the Tables contained in the Third Schedule hereto for sensitiveness.

   For beam scales the addition of this amount on either side shall cause an appreciable movement of the beam. For other vibrating instruments the addition of this amount shall cause the beam or steelyard to rise or fall to the limit of its range of movement.

54.   Tests for error

   A weighing instrument of the vibrating type shall be tested for error by ascertaining the weight in excess or deficiency (if any) required to bring the beam or steelyard of the instrument to a horizontal position when fully loaded.

   A weighing instrument of the accelerating type shall be tested for error by ascertaining the weight required when the instrument is fully loaded just to keep the beam or steelyard in a horizontal position on its stop or carrier and no more.

55.   Acceleration

   A weighing instrument of the accelerating type shall be tested for acceleration by ascertaining the weight required to bring back the beam or steelyard from its position of greatest displacement to the horizontal position, the instrument being fully loaded and truly balanced. The amount of acceleration permissible in an accelerating instrument shall not exceed twice the allowance for error in the same instrument.

56.   Allowances

   For weighing capacities not included in the relevant Tables contained in the Third Schedule hereto the allowances for sensitiveness and error shall be proportional.

57.   Balance

   The inspector shall ascertain that the instrument is properly balanced when not loaded, that the beam or steelyard has sufficient room for oscillation and that it returns to the position of equilibrium or that the indicator returns to the zero mark when a load is removed.

BEAM SCALES (regs 58-65)

58.   Definition

   The term "beam scale" means any equal-armed weighing instrument the pans of which are below the beam.

59.   Classification

   Beam scales shall be divided into three classes:

   (a)   Class A includes only chemical and assay balances and other beam scales provided with means for relieving all the bearings and knife-edges. Class A instruments must satisfy the requirements of Table VI contained in the Third Schedule hereto and need not be marked with a class mark;

   (b)   Class B includes only beam scales (other than Class A instruments) which satisfy the requirements of Table VII contained in the Third Schedule hereto;

   (c)   Class C includes all beam scales (other than instruments in Class A or Class B) which satisfy the requirements of Table VIII contained in the Third Schedule hereto.

   Every beam scale falling within either Class B or C shall be indelibly marked with the appropriate class mark.

60.   Prohibition of certain types

   Examination. – The following shall not be admitted for verification–

   (a)   accelerating beam scales;

   (b)   new swan neck beam scales of a capacity of less than 30 lb. or the beam of which is less than twenty-four inches in length between the terminal knife edges;

   (c)   swan neck beam scales not fitted with flat end bearing and swivel hooks;

   (d)   beam scales with loaded weight pans;

   (e)   beam scales of a capacity of less than 200 lb. with wooden scale boards.

61.   Balancing

   Any attachment for adjusting the balance of a beam scale shall be permanently fastened and, where a balance ball or box is fitted for occasional adjustment, it shall be so fixed that it cannot readily be tampered with. Beam scales with wooden scale boards shall be provided with a balance ball or box.

62.   Half-load test

   Verification. – No instrument shall be verified if, with the pans loaded to half capacity, any appreciable difference in its accuracy results from moving the knife-edges or bearings laterally or backwards or forwards within their limits of movement.

63.   Position of loading

   No instrument shall be verified if it is not just irrespective of the position of the load on the pan.

64.   Permissible errors

   The errors permissible on the verification of beam scales shall be as specified in Tables VI, VII and VIII contained in the Third Schedule hereto.

65.   Position of stamping

   Stamping. – On beam scales the stamping plug shall be inserted immediately above or below the central knife-edge.

   Class A beam scales may be stamped on the pans in cases where the delicate construction of the beam might be affected by the insertion of a plug.

COUNTER MACHINES (regs 66-75)

66.   Definition

   The term "counter machine" means any equal-armed weighing instrument of a capacity not exceeding 100 lb., the pans of which are above the beam.

67.   Prohibition of certain types

   Examination. – The following shall not be admitted for verification–

   (a)   accelerating counter machines;

   (b)   counter steelyards;

   (c)   counter machines in which the working parts below the beams are not suitably enclosed;

   (d)   counter machines of the "Roberval" type in which the stays forming the lower side of the parallelogram are not in one piece;

   (e)   counter machines not fitted with a balance box or other receptacle for balancing material;

   (f)   counter machines having a sliding or tare weight.

68.   Construction

   When the beam or body has two sides, they shall be connected together by not less than two cross bars; and the supports for the pans shall be of suitable rigid structure, such as crosses strengthened by straps. Centre forks shall be so fixed that they cannot twist or get out of place.

   The bearing surface and points of contact of all stays, loops and hooks shall be of hard steel or agate.

69.   Balancing

   The balance box or other receptacle for balancing material shall be securely fixed beneath one of the pans and shall only be large enough to contain loose material to an amount not exceeding one percent of the marked capacity of the machine. No other balancing contrivances shall be permissible.

70.   Fall on machines

   The minimum "fall" either way on counter machines shall be as follows–

   CapacityInch
Not exceeding 5 lb.1/4
Above 5 lb. and not exceeding10 lb. 5/16
Above 10 lb. and not exceeding25 lb. 3/8
Above 25 lb. and not exceeding50 lb. 7/16
Above 50 lb.1/2

71.   Half-load test

   Verification.-No instrument shall be verified if, with the pans loaded to half capacity, any appreciable difference in its accuracy results from moving the knife-edges or bearings laterally or backwards or forwards within their limits of movement.

72.   Position of weights during test

   When the goods pan is not in the form of a scoop half the allowance for error shall not be exceeded if the centre of a load equal to half the capacity is placed on the goods pan anywhere within a distance from the centre equal to one-third the greatest length of the pan or if the pan has a vertical side, against the middle of that side. In this test the weight shall be entirely on the weights pan but in any position on it.

73.   Counter machines with scoops

   When the goods pan is in the form of a scoop the prescribed limits of error shall not be exceeded if half the full load is placed against the middle of the back of the scoop and the other half in any position on the scoop.

74.   Permissible errors

   The errors permissible on the verification of counter machines shall be as specified in Table IX contained in the Third Schedule hereto.

75.   Stamping

   On counter machines the stamping plug shall be inserted in an easily accessible part of the beam or body of the machine.

SPRING BALANCES (regs 76-85)

76.   Suspension

   A spring balance of a capacity of 30 lb. and under with the goods pan below the spring shall be permanently suspended from a stand, support or bracket.

77.   Dimensions of indicator

   The extremity of the index finger shall not exceed one thirty-second of an inch in width and shall not be more than one-tenth of an inch from the scale or dial.

78.   Dimensions of graduations

   The scale shall be graduated into approximately equal parts and the minimum width apart of the graduations shall not be less than one-sixteenth of an inch for a capacity of 30 lb. and under and not less than one-eighth of an inch for a capacity of 40 lb. and over.

79.   Range of adjustable indicator

   When the indicator is adjustable the range of adjustment shall not exceed one percent of the capacity of the instrument.

80.   Interval between graduations

   (1) The weights corresponding to the interval between consecutive graduation marks shall be as follows–

   Capacity

The weight must not exceed

1 lb.2 drams
2 lb. to 7 lb.4 drams
10 lb. to 15 lb.8 drams
20 lb. to 30 lb.1 oz.
40 lb. to 60 lb.2 oz.
100 lb. and over1/200th of capacity

   Capacities between 1 lb. and 100 lb. other than those in the above table are not permitted.

   When the graduation commences at a fixed load the position of the indicator, when there is no load, shall be indicated by a zero mark.

   (2) Notwithstanding the provisions of paragraph (1) of this regulation a spring balance of 50 lb., capacity which is marked clearly and permanently with the words 'for tea estate use only' shall be deemed to comply with this regulation if the interval between successive graduations does not exceed 1/200th of the capacity.

81.   Position of the load during test

   Verification. – When the pan is below the spring, the prescribed limits of error shall not be exceeded wherever the load is placed upon it. When the pan is above the spring the regulation regarding the position of the load on the pans of counter machines shall apply.

82.   Testing of graduations

   Each numbered graduation shall be tested; intermediate graduations may be tested if necessary.

   No instrument shall be deemed to be just unless it satisfies a forward and backward test, provided that in each case the spring shall be allowed to vibrate before the reading is taken.

83.   Fatigue test

   The inspector may test the balance for efficiency or ability to recover by leading on the pan a load equal to its maximum capacity for a period not exceeding twenty-four hours, and then, after the expiration of four hours, testing for accuracy.

84.   Permissible errors

   Spring balances of a capacity of 30 lb. and under shall satisfy the requirements as regards error of counter machines of similar capacity. For spring balances of a capacity of 40 lb. and over, the error shall not exceed the weight corresponding to a quarter of the interval between consecutive graduations.

   Spring balances shall not be tested for sensitivity.

85.   Position of stamping

   On spring balances, the stamping plug shall wherever possible, pass through the dial and the frame. The plug shall be so supported as to avoid risk of injury during stamping.

STEELYARDS (regs 86-91)

86.   Prohibition of certain types

   The following shall not be admitted for verification unless of a pattern approved, by the Chief Inspector of Weights and Measures–

   (a)   any steelyard which is reversible and has three hooks;

   (b)   any accelerating steelyard;

   (c)   any counter steelyard;

   (d)   any steelyard not having a zero graduation;

   (e)   any steelyard of capacity of less than 60 lb.

87.   Construction

   Examination. – Steelyards shall be made of wrought iron or steel and the shank shall be perfectly straight.

   Each set of notches of graduations on the shank shall be cut in one plane and be at right angles to the shank.

   All steelyards shall be provided with a stop or other suitable arrangement to prevent excessive oscillation of the shank.

   Sliding poises and suspending hooks shall be securely attached to the instrument.

   All end fittings shall be securely fixed to the shank.

   The sliding poise shall be freely movable without risk of injury to the notches from constant use, and there shall be a stop to prevent it travelling behind the zero mark or lowest graduation.

88.   Balancing

   Where a balancing arrangement is fitted it shall comply with the requirements for platform machines.

89.   Method of testing

   Verification. – Each numbered graduation shall be tested and intermediate graduations may be tested if necessary. The instrument shall be tested backwards and forwards.

90.   Permissible errors

   The errors permissible on the verification of steelyards shall be twice those prescribed for counter machines or platform machine of a similar capacity.

91.   Position of stamping plug

   On steelyards the stamping plug shall be inserted in the face of the shoulder of the steelyard.

DEAD-WEIGHT MACHINES (regs 92-97)

92.   Definition

   The term "dead-weight machine" means any weighing instrument similar in principle of construction to a counter machine but of a capacity of more than 100 lb.

93.   Construction

   Examination. – The bearing surfaces and points of contact of all hooks, stays and loops, shall be of hard steel and the centres shall have rectangular shoulders fitted and firmly secured into rectangular holes.

   The bearing surface of the adjustable slides shall be of hard steel and the stems holding them in position shall be secured by lock nuts.

   The goods platform shall not exceed in length the length of the beam and in width double the width of the beam. Folding wings shall not increase such dimensions more than one-third in either direction.

   Platforms shall be of metal or hard wood.

   Fall. –The minimum fall in dead-weight machines shall be five-eighths of an inch both ways for vibrating machines and seven-eighths of an inch one way for accelerating machines.

94.   Balancing

   Loose balancing material shall be contained in a balance box permanently fixed beneath one platform and its weight shall not exceed one percent of the capacity of the machine. Any other balancing material shall be in one piece and shall be securely attached to the machine.

95.   Method of testing

   Verification. – Half the allowance for error shall not be exceeded if a load of one-quarter the capacity is placed successively at the middle of the front and back of each platform and centrally over the knife edges on each side.

96.   Permissible errors

   The errors permissible in the verification of dead-weight machines shall be the same as for platform machines of similar capacity. In carrying out the tests for sensitiveness and error the load shall be distributed over the platforms.

97.   Position of stamping plug

   Stamping. – On dead-weight machines the stamping plug shall be inserted in a conspicuous and easily accessible part of the beam of the machine.

PLATFORM MACHINES AND WEIGHBRIDGES (regs 98-110)

98.   Test in situ

   Examination. – Weighbridges and dormant platform machines shall be verified and stamped in situ in addition to any preliminary test on the maker's premises.

99.   Foundations

   Weighbridges and dormant platform machines shall only be permitted if the foundation or supporting base is sufficiently firm to be capable of carrying the maximum load without change of form or level.

100.   Construction

   The steelyard of a machine shall be in a perfectly straight plane on its upper surface or edge and shall not involve any readily removable parts except the support for the counterpoises. There shall be a stop or stops to prevent the sliding poise or poises from travelling behind the zero graduation.

   The steelyard or registering mechanism may be confined in a locked box or case, provided that the indications or graduations are visible.

101.   Travel

   The minimum travel of the steelyard in platform machines shall be three-eighths of an inch both ways for vibrating machines, and five-eighths of an inch one way for accelerating machines. The minimum travel of the steelyard in weighbridges shall be half an inch both ways for vibrating machines, and three-quarters of an inch one way for accelerating machines.

102.   Counterpoises

   Where a counterpoise is used in connection with a loose receptacle or frame it shall be of a shape distinct from all the other counterpoises. All loose counterpoises shall be identified with the machine by a number or other indelible mark. They shall be marked with their equivalent weight in the following manner, e.g.:

      = 100 lb.

A loose counterpoise marked in Imperial denomination shall not be of hexagonal shape.

103.   Balancing

   All weighbridges and platform machines shall be fitted with a balancing arrangement which shall be capable of being operated only by means of a detachable key. The range of balance shall not exceed one-half percent of the capacity of the machine, and shall not be less than one-eighth percent each way. For weighbridges the range may be doubled.

104.   Gravity balls

   Where a gravity ball is provided it shall be adjustable only by means of a mechanical appliance unless the ball is completely enclosed.

105.   Self-indicating machines

   The following provisions shall apply to weighbridges and platform machines fitted with dials–

   (a)   racks and pinions shall be of hard metal;

   (b)   the registration mechanism and cylinders or tanks containing liquid (if any) shall be adequately protected from dust and excessive variations of temperature;

   (c)   Graduation marks. – the graduation marks shall be clear and distinct and shall not–

      (i)    exceed one-thirty-second of an inch in width on platform machines;

      (ii)    exceed one-sixteenth of an inch in width on weighbridges;

      (iii)   be less than one-eighth of an inch apart, measured from centre to centre; and denominated subdivisions shall be of longer lines than minor graduations;

   (d)   the extremity of the indicator shall in no position be at the greater distance from the graduated surface of the dial than three-sixteenths of an inch; and shall be made to meet, but not obscure, the graduation marks.

106.   Mode of testing

   Verification. – Each numbered graduation shall be tested and minor graduations may be tested if necessary. Loose counterpoises shall be tested. The machine shall be tested to its maximum capacity or as near thereto as circumstances permit. When sufficient standard weights are not available to test a machine to its capacity, it may, where practicable, be loaded with suitable heavy material to within such amount of its maximum capacity as is equal to the total of standard weights available. No machine which does not then indicate correctly the addition of any standard weight shall be deemed to be just.

107.   Test at quarter load

   Half the allowance for error shall not be exceeded if a load equal to one-quarter the maximum capacity, or as near thereto as practicable, is placed successively at the middle, near the ends and at the corners of the platform.

108.   Relieving gear

   When a platform machine or weighbridge is fitted with a relieving gear the prescribed limits of error shall not be exceeded when the machine is put steadily out of and into gear. The plate or platform shall be entirely disengaged from its bearings when the machine is in relief.

109.   Permissible errors

   The errors permissible on the verification of weighbridges and platform machines shall be as specified in Table X contained in the Third Schedule hereto.

110.   Position of stamping plug

   Stamping. – On weighbridges and platform machines other than self-indicators, the stamping plug shall be inserted either in the shoulder or the nose end of the steelyard.

   On self-indicating machines the stamping plug shall be inserted in the dial or beam.

   Loose counterpoises shall be date-marked upon the lead in the adjusting hole after the completion of the test.

CRANE MACHINES (regs 111-115)

111.   Construction

   Examination. – Crane machines shall comply with the constructional requirements for platform machines as far as practicable. All working parts shall be suitably enclosed and protected from damp and dust.

112.   Balancing

   The range of balancing or adjusting arrangements shall not exceed two percent of the capacity of the machine.

113.   Mode of testing

   Verification. – Crane machines shall be tested to their full working capacity. Each numbered graduation shall be tested.

114.   Permissible errors

   The errors permissible on the verification of crane machines shall be for machines below one ton capacity the same as for vibrating platform machines, and for machines of one ton and upwards the same as for vibrating weighbridges.

115.   Position of stamping plug

   On crane machines the stamping plug shall be inserted in a conspicuous part of the steelyard or dial of the machine.

AUTOMATIC MACHINES (regs 116-121)

116.   Definition

   The term "automatic weighing machine" means a machine in which special self-acting machinery is introduced to effect an automatic feed, the rapid weighing of pre-determined quantities, the registration and summation of loads and other similar purposes or some of them.

117.   Construction

   Examination and Verification. – Automatic machines and their integral parts such as special beams, etc., shall, as far as practicable, satisfy the requirements of these Regulations, where such are applicable, as regards principle, detail or material of construction.

   Beams need not be marked with any class, but shall be identified with the machine by a number or other sufficient mark of identification which shall be indelible.

   The adjusting mechanism shall be suitably secured or protected so that it cannot readily be tampered with.

118.   Mode of testing

   The machine shall, where practicable, be tested directly by the application of standard weights, and the accuracy of the output or cut-off shall be verified by re-weighing on another verified and stamped weighing instrument as many continuous loads as the inspector may think necessary.

119.   Totalizing machines

   In testing "totalizing machines" thirty loads shall be passed over the machine, i.e. ten minimum loads, ten maximum loads, and ten loads of the mean between the minimum and maximum.

120.   Permissible errors

   The errors permissible on the verification of automatic machines shall be as specified in Table XI contained in the Third Schedule hereto.

121.   Position of stamping plug

   Stamping. – On automatic machines the stamping plug shall be inserted in the beam, shank or other conspicuous part of the machine.

SELF-INDICATING WEIGHING INSTRUMENTS (regs 122-128)

122.   Definition

   The term "self-indicating weighing instrument" means any weighing instrument on which part or the whole of the weight or the money value of the goods weighed is indicated by means of a moving finger or chart or other device approved from time to time by the Chief Inspector of Weights and Measures.

123.   Graduations

   Examination. – The graduation marks shall be clear and distinct. Denominated subdivisions shall be of longer lines than minor graduations.

   On instruments for counter use and suspended weighers the graduations shall not exceed one-sixty-fourth of an inch in width.

   The minimum distance between graduations measured from centre to centre shall be not less than one-sixteenth of an inch:

   Provided that a lens or other approved device may be fitted to the instrument for the purpose of magnifying the distance apart of the graduation marks so as to bring them into conformity with this regulation.

   The weight and price indicated shall be clearly legible, and in the case of partially enclosed charts, the aperture through which the indications are read shall be sufficiently large to permit the next lower graduation to be read.

124.   Index band or finger index

   Cylindrical self-indicating instruments shall be fitted with a steel band or double wires for indicating the price and weight. The indicating band or wire or the extremity of the indicating finger, where such is used, shall not exceed one-sixty-fourth of an inch in width, or be distant from the chart more than one-sixteenth of an inch so that no appreciable error may result from parallax.

125.   Value of graduation

   In self-indicating instruments of a capacity not exceeding 150 lb. the maximum value of the smallest subdivision on the chart shall not exceed the amount shown in the following table–

Capacity of Instrument

Maximum Value of smallest division

Under 2 lb.4 drams
2 lb. and under 20 lb.8 drams
20 lb. and not exceeding 30 lb.1 oz.
Over 30 lb. and not exceeding60 lb 2 oz.
Over 60 lb.4 oz.

126.   Mode of testing

   Verification. – All numbered graduations shall be tested and intermediate graduations may be tested if necessary. On self-indicating instruments provided with indicators on both the seller's and purchaser's sides the readings on both charts shall coincide. The weight shall be correctly indicated whether the test is forward of backward.

127.   Permissible errors

   The errors permissible on verification of self-indicating instruments shall be as specified in Table XII contained in the Third Schedule hereto.

128.   Position of stamping

   Stamping. – On self-indicating instruments the stamping plug shall be in a conspicuous and essential part of the instrument, and shall be provided in addition to any seals which may be prescribed by the Chief Inspector of Weights and Measures.

VEHICLE TANKS (regs 129-144)

129.   Definitions

   A vehicle tank, hereinafter referred to as a "tank" shall, for the purpose of these Regulations mean a container, which may or may not be subdivided into two or more compartments, mounted on a wagon or motor truck, and used for the scale or delivery by measures of capacity, of paraffin, fuel oil, petrol, or petrol substitutes. When a tank is subdivided, the term "compartment" shall mean any one of the subdivided portions of the tank.

130.   Construction and design

   A tank shall be constructed in accordance with these Regulations and shall be–

   (a)   of such shape, material, reinforcing elements and method of shaping chosen so that the tank is sufficiently unaffected by atmospheric agents and the liquids it contains and is practically not subject to distortion under rated operating conditions. It shall satisfy all other regulations concerning transport of dangerous liquids, safety at work, the construction of pressure vessels and protection of pressure vessels and protection against fire, quality of liquid transported and health;

   (b)   (i)   the tank shall be pressure tested;

      (ii)   leak tested using water at atmospheric pressure; after filling the tank shall show no traces of leakage or dampness at the joints;

   (c)   either fitted with an approved device through or by means of which the liquid can be measured or calibrated in the manner prescribed by the Regulations;

   (d)   the reference height H of a tank or compartment shall not vary during filling by more than the following two values–

         2 mm;

         H/1000;

   (e)   the capacity of the compartment shall not change by more than 1/1000 of its measured volume when the neighbouring compartments are filled or emptied.

131.   Quantity indicators, piping, gauges and valves

   All quantity indicators, gauges, piping and valves shall be of such strength, design, construction and material that they may reasonably be expected to withstand ordinary usage without the accuracy of the instrument being impaired.

132.   Complete delivery required

   (1) The delivery piping connected to a tank shall be of such design and construction that, when the vehicle on which it is mounted is standing on a level plane, complete delivery can be made from the tank or any compartment thereof. To ensure complete drainage the lower generatrix of the tank shall have a slope of at least 20 with the vehicle on level ground.

   (2) Where a tank is fitted with an approved meter, the delivery piping and manifold outlet (where one is provided) shall in addition be of such design and construction as to preclude all possibility of liquid being trapped in any empty compartment whilst delivery is taking place from one which is full. The connection between the stop valves of the tank and these installations shall be by detachable couplings, which shall be as short as possible and easy to assemble and take apart, except those designed for a special purpose (for example, tanks used for aircraft refuelling).

   (3) The dome (manhole) when fitted shall be as on the upper part of the body of the tank and welded thereon. If the side walls of the dome are mounted so that they penetrate the tank shell, the formation of air pockets on the upper part of the shell shall be avoided by providing orifices or cutouts at the level of the upper internal generatrix.

133.   Ventilation and filler openings

   The requirements of a tank shall be as follows–

   (a)   tanks shall be suitable and effectively ventilated to prevent the formation of air pockets on filling or retention of liquid on emptying in all positions of use and, in the case of new tanks, the filler opening shall be of such size and construction as readily to permit of visual internal inspection;

   (b)   anti-wave devices and reinforcing elements that may be fitted in the tank shall be of a shape and shall be provided with orifices so that filling, draining and checking the emptiness of the tanks is not impended;

   (c)   the placing of deadwood inside the tank of compartment for the purpose of adjusting the capacity to a given value or any other body which, when changed or removed, could modify the capacity of the tank, is prohibited.

134.   Number and capacity to be marked

   Each compartment or tank which is constructed to deliver a fixed quantity of liquid shall be numbered and shall have its capacity clearly and indelibly marked on at least one side thereof, thus–

"Capacity .............................................gallons to indicator".

   Where a tank has more than one compartment, each such compartment, together with its outlet, valve, shall be correspondingly numbered.

135.   Position of indicator

   An indicator or other approved device shall be provided for each compartment and such indicator or device shall be centrally situated in respect to the longitudinal and diametrical axes in cylindrical tanks and the longitudinal and major axes in elliptical tanks.

136.   Design and sealing of indicators

   Where a tank or compartment is constructed to deliver a fixed quantity only, the quantity-indicator shall function within a dome centrally situated on the top of such tank or compartment and shall be fixed rigidly so as to indicate at the centre of the dome.

   The indicator shall clearly and distinctly define, by means of a plated or polished flat circular metal disc of at least 2.5 mm diameter, the height to which the tank or compartment must be filled in order to contain its marked capacity.

   If the indicator is adjustable, it shall be so constructed that it can be sealed in such a manner as to prevent any change in its position without the seal being broken.

This section of the article is only available for our subscribers. Please click here to subscribe to a subscription plan to view this part of the article.