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

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... Units and Systems of Weights and Measures Their Origin , Development , and Present Status UNITED STATES DEPARTMENT OF COMMERCE

... Units and Systems of Weights and Measures Their Origin , Development , and Present Status UNITED STATES DEPARTMENT OF COMMERCE

**NATIONAL BUREAU**OF STANDARDS PERIODICALS OF THE**NATIONAL BUREAU**OF STANDARDS ( Published monthly. Front Cover. Page

PERIODICALS OF THE

PERIODICALS OF THE

**NATIONAL BUREAU**OF STANDARDS ( Published monthly ) The**National Bureau**of Standards is engaged in fundamental and applied research in physics , chemistry , mathematics , and engineering . Projects are conducted in ... Page

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**National Bureau**of Standards Circular 570 Issued May 21 , 1956 For sale by the Superintendent of Documents , U. S. Government Printing Office , Washington 25 , D. C. Price 25 cents DEPOSITED BY THE UNITED STATES OF AMERICA The National ... Page

DEPOSITED BY THE UNITED STATES OF AMERICA The

DEPOSITED BY THE UNITED STATES OF AMERICA The

**National**Standards of Length and Mass , U. S. Prototype Meter 27 and U. S. Prototype Kilogram 20 , are kept in this Standards Vault . Made of a stable alloy containing 90 percent of platinum ... Page

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**National Bureau**of Standards receives many requests for information . on both the customary and metric systems of weights and measures . It is to serve this need - for teachers , students , and the general public that this Circular has ...### 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.