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

### From inside the book

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Page 7

An illustration of rather com- plex subdividing is found on the

An illustration of rather com- plex subdividing is found on the

**scales**used by draftsmen . These**scales**are of two types : ( a ) architects , which are commonly graduated with**scales**in which 32 , 16 , % , 4 , % , 2 , 4 , 1 , 12 , and 3 ... Page 8

Machinist

Machinist

**scales**are commonly graduated decimally along one edge and are also graduated along another edge to binary fractions as small as 4 inch . The**scales**with binary fractions are used only for relatively rough measurements . Page 9

Uncertainties in some of the measurements and in the thermometric

Uncertainties in some of the measurements and in the thermometric

**scale**of the early compari- William F. Meggers positions the eyepiece of an optical train prior to observation of the circular interference fringes of the green light ... Page 10

The Bureau does not test carpenters rules , machinists

The Bureau does not test carpenters rules , machinists

**scales**, draftsmans**scales**, and the like . Such apparatus , if test is required , should be submitted to State or local weights and measures officials . Page 13

The illustration on right shows 1 of 2 standard test weight cars , owned and operated by NBS for calibrating and adjusting the master railway track

The illustration on right shows 1 of 2 standard test weight cars , owned and operated by NBS for calibrating and adjusting the master railway track

**scales**of the Nation's railroads . The largest individual weight of these cars is 10 000 ...### 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.