## Circular of the Bureau of Standards, Issue 570U.S. Government Printing Office, 1956 |

### From inside the book

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**calibrations**of length standards . 3.2 . Standards of mass_ a . Distinction between mass and weight b . Effect of air buoyancy . c . Tests of standards of mass- Page Τ 1 1 2 2 2 2 4 5 5 5 6 8778 8 3.4 . Standards of capacity . 3.3 ... Page 7

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**calibrated**gage blocks . The NBS checks master gage blocks of industry . Shown on the table are various gage blocks and ring gages used by industry along with some of the equipment used by NBS for this ...**Calibration**Laboratory . 7. Page 10

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**Calibration**of Line Standards of Length and Measur- FIGURE 4 . In this laboratory the Bureau calibrates steel tapes used by surveyors and engineers and the more precise base - line tapes used by the U. S. Coast and Geodetic Survey . ing ... Page 12

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**calibration**and use of standards of mass is the buoyancy or lifting effect of the air . A body immersed in any fluid is buoyed up by a force equal to the weight of the displaced fluid . Two bodies of equal mass , if placed one on each ... Page 13

NATIONAL DEREAU OF STANDARDS IS PARTNENT COMMERCE FIGURE 6.

NATIONAL DEREAU OF STANDARDS IS PARTNENT COMMERCE FIGURE 6.

**Calibration**of weights by NBS . These two illustrations indicate extremes of weights routinely**calibrated**by NBS . The one on left shows the small weights ( down to 0.05 mg ) ...### Common terms and phrases

000 cubic centimeters apoth apothecaries apothecaries weight avdp avoirdupois pound Britain British Imperial Bureau of Standards Bureau of Weights bushel calibration Circular cubic centimeter cubic decimeter cubic feet cubic foot cubic inches cubic meter decimal defined dekaliter dry quarts equivalent fluid drams fluid ounces fluid scruple grains grams gross or long hectare hundredweight Imperial gallon inch exactly International Bureau length and mass liquid pint liquid quarts liter long ton mass standard metric system milligrams milliliters millimeters National Bureau number system pint or quart primary standard Prototype Kilogram short ton square centimeter square inch square meter square yard standards of capacity standards of length standards of mass struck measure subdivisions system of weights tonnage troy pound U. S. fluid ounce U. S. gallon U. S. Government Printing unit of weight United States Prototype units and standards Units and Systems UNITS OF CAPACITY volume weights and measures

### Popular passages

Page 18 - Square Measure 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet = 1 square yard (sq. yd.) 30£ square yards = 1 square rod (sq.

Page 18 - Cubic Measure 1728 cubic inches (cu. in.) =1 cubic foot (cu. ft.) 27 cubic feet = 1 cubic yard (cu. yd.) 128 cubic feet = 1 cord (cd...

Page 29 - Used in assaying. The assay ton bears the same relation to the milligram that a ton of 2,000 pounds avoirdupois bears to the ounce troy; hence the weight in milligrams of precious metal obtained from one assay ton of ore gives directly the number of troy ounces to the net ton.

Page 4 - The essential features of the system were embodied in a report made to the French National Assembly by the Academy of Sciences in 1791. A number of other nations were invited to cooperate with France in establishing the new system, and Holland, Denmark...

Page 12 - When an equal-arm balance is used to compare an object with standards of mass ("weights"), the effects of variations in the acceleration of gravity are self-eliminating and need not be taken into account, but the apparent mass of the object is slightly different from the true mass because of the buoyant effects of the surrounding air. Mass can then be computed from apparent mass by applying a correction for air buoyancy. When a spring balance is used, an additional correction accounting for the local...

Page 20 - Dry Measure. — 2 pints = 1 quart; 8 quarts = 1 peck; 4 pecks = 1 bushel.

Page 14 - The mean solar day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds.

Page 4 - The liter is defined as the volume occupied, under standard conditions, by a quantity of pure water having a mass of 1 kilogram. This volume is very nearly equal to 1 000 cubic centimeters or 1 cubic decimeter; the actual metric equivalent iĦ.

Page 20 - The meter bars, however, continue in use as a standard for most types of measurements. In the metric system, designations of multiples and subdivisions of any unit may be arrived at by combining with the name of the unit the prefixes deka, hecto, and kilo, meaning, respectively, 10, 100, and 1,000, and deci, centi, and mill!, meaning, respectively, one-tenth, onehundredth, and one-thousandth.