Circular of the Bureau of Standards, Issue 570U.S. Government Printing Office, 1956 |
From inside the book
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Page 4
... earth . The Meter of the Archives , the platinum end - standard which was the standard for most of the 19th century , at first was supposed to be exactly this fractional part of the quadrant . More refined measurements over the earth's ...
... earth . The Meter of the Archives , the platinum end - standard which was the standard for most of the 19th century , at first was supposed to be exactly this fractional part of the quadrant . More refined measurements over the earth's ...
Page 11
... earth . Confu- sion sometimes arises from the practice of referring to standards of mass as " weights " and from the fact that such standards are compared by " weighing " one against another by means of a balance . Standard " weights ...
... earth . Confu- sion sometimes arises from the practice of referring to standards of mass as " weights " and from the fact that such standards are compared by " weighing " one against another by means of a balance . Standard " weights ...
Page 13
... earth ; ( a ) on its axis , and ( b ) around the sun . The time it takes the earth to make a complete rotation on its axis is called a day , and the time it takes it to make a complete journey around the sun , as indicated by its ...
... earth ; ( a ) on its axis , and ( b ) around the sun . The time it takes the earth to make a complete rotation on its axis is called a day , and the time it takes it to make a complete journey around the sun , as indicated by its ...
Page 14
... earth , in its motion around the sun , does not move at a uniform speed , and the sun in its apparent motion does not move along the equator but along the ecliptic . Therefore the apparent solar days are not of exactly equal length . To ...
... earth , in its motion around the sun , does not move at a uniform speed , and the sun in its apparent motion does not move along the equator but along the ecliptic . Therefore the apparent solar days are not of exactly equal length . To ...
Page 15
... earth with respect to various heavenly bodies . The average time of rotation over a period of several days is used as a standard interval to which is compared the interval indicated by extremely accurate crystal clocks owned by the ...
... earth with respect to various heavenly bodies . The average time of rotation over a period of several days is used as a standard interval to which is compared the interval indicated by extremely accurate crystal clocks owned by the ...
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 i¡.
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.