Specifications, Tolerances and Regulations for Commercial Weights and Measures and Weighing and Measuring DevicesU.S. Government Printing Office, 1915 - Weights and measures |
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Common terms and phrases
adjusting pin allowed in excess Balances and Scales beam or reading bushel butter-fat-test scale cap-seat or stopple commodity plate constructed counter platform scales counter scales device intended devices for adjusting diameter Drams dry capacity measures dry measures edge error excess or deficiency face or dial following values gallon graduated scale greater than one-half heading Counter Balances inch knife-edge lesser load leveling devices Liquid measures manufacturers maximum sensibility reciprocal measures of length metal metric system Milligrams minimum graduation notches one-half the tolerance operative or accessible Ounces pan or plate pint pointer poise position of equilibrium Pounds quart reading face rebalanced at zero removable weights scale a definite scale is level scale or arc scales whose weight scoop screw-driver special tests described Specifications.-1 Spring balances spring scales term sensibility reciprocal tolerance allowed tool or device trig-loop value graduations values given weight indications weight or weights weight required weights and measures wrench
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Page 19 - Spring balances of such construction that a weight or weights which are not visible can be added so as to affect the indications of the scale, shall be equipped with a device which will clearly indicate on the customers...
Page 10 - General Specifications. — 1 . The nominal or rated capacity of a scale is the largest weight indication which can be obtained by the use of all its reading or recording elements in combination. When one reading or recording element of the scale is designed for auxiliary use only, such as a small bar and poise intended for use in determining weights intermediate between two graduations on the principal bar of the beam, the weight value of this reading or recording element...
Page 10 - ... usually furnished with the scale when weights are included, shall be included in the sum of the weight values of the reading elements. 2. All scales not equipped with a beam or reading face graduated to the full capacity of the scale, or those not equipped with a graduated beam or reading face, which, taken in Connection with another graduated beam or beams or with a graduated runner, indicates the capacity of the scale, shall have the nominal or rated capacity conspicuously, clearly and permanently...
Page 27 - ... or alloy of metals not softer than brass: Provided, however, That weights below one-fourth ounce shall not be made of iron or steel, but may be made of aluminum. 2. Weights shall have smooth surfaces, and no weight of more than 1 gram, 1 pennyweight, or 1 scruple shall have sharp points or corners.
Page 9 - The tolerances to be allowed in excess and in deficiency on all liquid capacity measures shall not be greater than the following values: Provided, however, That the manufacturers...
Page 26 - All scales whose weight indications are changed by an amount greater than one-half the tolerance allowed, when set in any position on a surface making an angle of 5 per cent or approximately 3 degrees with the horizontal, shall be equipped with leveling screws and with a device which will indicate when the scale is level.
Page 17 - A" scales include the following: Scales of the portable platform type; and also scales of the dormant type which are installed inside of a building having side walls and roof, which protect the scale from weather effects and from sudden changes of temperature. "Class B...
Page 7 - ... shall not be greater than the values shown in the following table : Provided, however, That the manufacturers...
Page 15 - The sensibility reciprocal is a measure of the sensitivity of a balance, and is the weight required to move the position of equilibrium of the beam, pan, pointer, or other indicating device of a scale a definite amount at the capacity or at any lesser load. For a complete definition of sensibility reciprocal see US Bureau of Standards "Handbook M 85, pp.
Page 17 - ... type which are not installed inside of a building having side walls and roof, and which are exposed to weather effects and sudden changes of temperature. NOTE. — The latter effect, since it causes the condensation of moisture on the scale parts, often has as serious results on the condition of the scale as have weather effects. The columns with the heading "Tolerance on ratio" refer to the error in the ratio or multiplying power of scales with which counterpoise weights are used.