SCHDULE 1 (See rule 3)
Denomination, material, design and permissible error of secondary standards of weights and measures.
1. Secondary Standard of weights. Kilogram Gram Milligram Series Series Series (kg) (g) (mg)
2 . . . . . . 50 50 2 . . . . . . 20 20 10 10
1.2. Material. 1.2.1. Weight of 10 kg to 1 kg shall be cast from bronze of the following composition:- Constituent Per cent
Tin . . . . 9.5 to 10.5 Zinc . . . . 1.5 to 2.5
2.2. Weights of 500mg to 100mg shall be made of cupronickel having a nominal composition of 75 per cent copper and 25 per cent nickel.
1.2.3. Weights of 50 mg to 1 mg shall be made of commercial aluminium sheets.
Shape of Weights 1.3.1. 10 kilogram.– Cylindrical body cored on top for adjustment with separate handle, screwed down to body and sealed.
1.3.2. 5 kilogram to 20 gram.– Basically cylindrical with a knob on top and case integrally, and at the bottom a screwed core with the plug duly sealed, dimensions relative to the capacity of each 1.3.3. 10 gram to 1 gram.– Cylindrical, solid body with integral knob without locking 1.3.4. Milligrams series.– Square sheets, with one corner bent at right angles. 1.4. Limits of error to be tolerated.– The limits of error to be tolerated in excess and in deficiency shall be as follows :- Denomination Limits of error to be tolerated
5kg . . . . . . . . . 25 2kg . . . . . . . . . 10 1kg . . . . . . . . . 5
500g . . . . . . . . . 2.5 200g . . . . . . . . . 1.0
100g . . . . . . . . . 0.5 50g . . . . . . . . . 0.3
20g . . . . . . . . . 0.25 10g . . . . . . . . . 0.20 5g . . . . . . . . . 0.15
2g . . . . . . . . . 0.12 1g . . . . . . . . . 0.10 500mg . . . . . . . . . 0.08
200mg . . . . . . . . . 0.06 100mg . . . . . . . . . 0.05 50mg . . . . . . . . . 0.04
20mg . . . . . . . . . 0.03 10mg . . . . . . . . . 0.025 5mg . . . . . . . . . 0.020
2mg . . . . . . . . . 0.02 1mg . . . . . . . . . 0.02
II. Secondary Standard of Linear Measures (1) Denomination 1 metre. (2) Detailed requirements 2.1. The standard shall be in the form of a bar with one beveled edge as per sketch given below. The bevel shall carry the graduations and shall be sloped about 30 from the horizontal. The outside edge
formed by the inter section of the beveled face and the underneath surface shall have a vertical face not more than 0.4 mm wide. The bar may hollowed from the underneath to reduce the weight and seating area and shall provide for a total depth of section not less than 18 mm. there shall be an
ungraduated portion extending beyond the terminal graduation on either side by about 30 to 40 mm.
2.2. A slider bar shall be secured to the top of the standard with a magnifying lense to facilitate
2.3. The method of securing the slider bar to the standard shall be such as to prevent distortion of the latter should unequal expansion takes place.
2.4. Suitable handles of the same material as given in paragraph 2.8. shall be provided so that contact between hand and metal can be avoided.
2.5. The supporting points (where handles are fixed) shall be between 0.55 and 0.60 of the length of the blank apart and shall be symmetrically placed relative to the length of the blank.
2.6. The measure shall be quite robust, straight and free from flaws.
2.7. The graduated surface shall be highly polished and free from surface irregularities in the neighbourhood of the graduated lines. If plated, the surface shall be free from undesirable degree of crazing in the neighbourhood of lines.
2.8. The metal shall be rustless iron (e.g. chromium iron) or stainless steel (nickel chromium steel) or high nickel (25% or more) iron. Carbon steel with low or high carbon percentage suitable protected
against corrosion by composition, copper 56-60%. Lead 2.0 to 2.35% and Zinc remainder can also be used. In the latter case the measures are to be lacquered.
3. GRADUATIONS 3.1. A measure shall be divided into ten decimeters and hundred centimeters. The zero graduation shall be marked ‘0’ and the final graduation shall be marked ‘METRE’.
The numbers and other markings shall read progressively from left to right with the zero at the extreme left and the bevel nearest to the observer, and the graduation shall extend to the then edge
nearest to the observer. The first and the last cm shall be sub-divided into mm.
3.1.1. Graduation shall be suitably figured and marked at convenient intervals using abbreviations,
3.1.2. In addition to the graduated metre intervals a cm before zero shall be sub-divided into mm and read from right to left from the zero graduation, the cm before zero shall be marked ‘cm’ at the
3.2. The graduation lines shall be well defined, of symmetrical section and have clean edges.
3.3. The width of each graduation line shall be constant ± 10% of average width.
3.4. The graduation lines shall not differ in width, one from the other.
3.5. The width of graduation lines shall be between 0.005 to 0.015 mm (5 microns to 15 microns).
3.6. The graduation lines shall be straight.
3.7. The graduation lines shall be parallel to one another. 3.8. The graduation lines shall be square to the scale axis.
3.9. In the case of finer graduations, the spacings shall be such that any interval from one line to another is at the correct nominal position and spacing.
4. Limits of error to be tolerated. – The limits of error in excess and in deficiency to be tolerated shall be as follows:-
(a) Up to 1 mm . . . . = ± 0.015mm (15 microns) (b) Above 1mm and not exceeding 1 cm . = ± 0.075mm (75 microns) (c) Up to 1 metre (overall tolerance) . . = ± 0.4mm (400 microns)
Note:- (i) Each working standard shall bear the serial No., the name of the region/authority to which it
belongs and stamp of its standardization. (ii) These working standards shall be submitted for verification against the secondary and reference standards within the specified time limit.
III. Secondary Standard Measures of Capacity 1.1. Denominations Litre series Millilitre series (L) (ml)
10 . . . . . . . 500 5 . . . . . . . 200 2 . . . . . . . 100
1.2. Material
Secondary standard measures of capacity shall be cast of bronze of the same composition as in the case of secondary standard weights.
1.3 Shape of Capacity Measures 1.3.1. 10 and 5 litre. – cylindrical with inside diameters approximately equal to the height of the measures, and two handles attached securely to their sides.
1.3.2. –2 litres and below : Same shape as above but shall have one handle only.
1.3.3. The denominations of the measures shall be engraved on the outside surface.
1.3.4. Each set of measures shall be supplied with specially selected striking glasses.
1.4. Limits of error to be tolerated. – The limits of error in excess and deficiency to be tolerated shall be as follows :-
Denomination Limits of error to be tolerated (ml)
10 l . . . . . . . 4 5 l . . . . . . . 2
2 l . . . . . . . 1 1 l . . . . . . . 0.8 500 ml . . . . . . . 0.5
200 ml . . . . . . . 0.4 100 ml . . . . . . . 0.3 50 ml . . . . . . . 0.2
20 ml . . . . . . . 0.1 10 ml . . . . . . . 0.1
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SCHDULE 1 
Tin . . . . 9.5 to 10.5 Zinc . . . . 1.5 to 2.5
2.2. Weights of 500mg to 100mg shall be made of cupronickel having a nominal composition of 75 per cent copper and 25 per cent nickel.
1.2.3. Weights of 50 mg to 1 mg shall be made of commercial aluminium sheets.
Shape of Weights 
100g . . . . . . . . . 0.5 50g . . . . . . . . . 0.3
20g . . . . . . . . . 0.25 10g . . . . . . . . . 0.20 5g . . . . . . . . . 0.15
2g . . . . . . . . . 0.12 1g . . . . . . . . . 0.10 500mg . . . . . . . . . 0.08
200mg . . . . . . . . . 0.06 100mg . . . . . . . . . 0.05 50mg . . . . . . . . . 0.04
20mg . . . . . . . . . 0.03 10mg . . . . . . . . . 0.025 5mg . . . . . . . . . 0.020
2mg . . . . . . . . . 0.02 1mg . . . . . . . . . 0.02
II. Secondary Standard of Linear Measures 
1.1. Denominations