## Circular of the Bureau of Standards, Issue 570 |

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Page 4

This is also the basis of the

This is also the basis of the

**relation**between longitude and time . Since the earth makes one complete rotation ( 360 ° ) on its axis in 24 hours , a time change of 1 hour is represented by each 15 ° of longitude ( 360 / 24 = 15 ) . Page 5

In each case one must be accepted as the primary standard and the other derived therefrom by means of an accepted

In each case one must be accepted as the primary standard and the other derived therefrom by means of an accepted

**relation**. In the United States the yard is defined in terms of the meter , and the pound in terms of the kilogram . Page 6

This convenient

This convenient

**relation**does not exist in the U. S. system because a U. S. gallon of water at 62 ° F weighs about 8 % pounds , or 133 % avoirdupois ounces , and the U. S. gallon is equivalent to 4 × 32 , or 128 fluid ounces . Page 8

It is also im- portant that the

It is also im- portant that the

**relations**of these units to the units of other systems be definite , convenient , and known , in order that conversion from one system to another may be accurately and conveniently made . 3. Page 9

3 600 The

3 600 The

**relation**1 U. S. yard = ) meter , derived from the Law of 1866 that made the use of the 3 937 metric system legal in the United States , was confirmed by later comparisons of copies of the British yard with the U. S. national ...### What people are saying - Write a review

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### Common terms and phrases

acre adopted apothecaries avdp avoirdupois pound balance barrel body Britain British Bureau of Standards bushel calibration capacity Circular coal contains convenient corresponding cubic centimeter cubic decimeter cubic feet cubic foot cubic inches decimal defined Definitions difference divided early earth engineers equal equivalent example fields FIGURE fluid drams fluid ounces fundamental gallon given grains grams hundredweight inch exactly indicate industry interest International International Bureau kilogram known laboratory liquid liter material mean meter metric system mile milligrams milliliters millimeters National Bureau origin physical pint precision present Prototype Meter publications published quart reference relation respectively Roman scales scruple short square square meter square yard standards of length standards of mass statute subdivisions system of weights tables Tests tonnage tons troy pound units usually various volume weights and measures yard

### 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.