Part IIWorking Standard Ccapcity Measures
3.—(1) Working standard capacity measures provided pursuant to section 5(1) of the Act for use by inspectors of weights and measures shall be tested by one of the following methods:—
Method 1
(a)where the test relates to an indicated imperial measurement not exceeding 1 gal or an indicated metric measurement not exceeding 5 1, by transfer of water from an equivalent local standard capacity measure;
(b)in any other case by transfer of water from a local standard capacity measure of maximum possible capacity in relation to the working standard used the requisite number of times;
Method 2
by pouring water of a known temperature into the measure under test, when the measure is resting on a horizontal surface—
(a)where the nominal capacity of the measure defined by a line, until the bottom of the meniscus coincides with the top of that line or with the top of any graduation line or tolerance mark being tested; or
(b)where the nominal capacity of the measure is defined by its brim, until the surface water coincides with the brim;
and in either case determining the weight of the water on a suitable weighing machine (the discrimination threshold of which in grams shall not be more than one-fifth of the equivalent amount in millilitres of the appropriate limit of error set out in Schedule 1 to these Regulations) and calculating therefrom the capacity of the measure in accordance with British Standard 1797: 1968(1) or British Standard 6696: 1986(2).
(2) A working standard capacity measure shall be tested as a measure of any amount in Schedule 3 to the Act which it is designed to measure and the accuracy of any tolerance marks adjacent to any graduation tested shall also be tested.
4. Every working standard capacity measure—
(a)which is made of glass shall have been tested within 12 months before use;
(b)which is made of metal and
(i)is of 50 1 or less or 10 gal or less shall have been tested within 6 months before use;
(ii)is of more than 50 1 or 10 gal shall have been tested within 24 months before use.
Tables for use in the calibration of Volumetric Glassware, SBN 580 00129 6, published by the British Standards Institution in February 1952, and revised in April 1968.
British Standard Methods for use and testing of capacity volumetric glassware, ISBN 0 580 15076 3, published by the British Standards Institution on 28th February 1986.