Page:Elementary Text-book of Physics (Anthony, 1897).djvu/495

 TABLES.

TABLE I.

Units of Length.

Foot = 30.48 cm. log. 1.484015 Inch = 2.54 cm, log. 0.404880

Units of Mass.

Pound = 453.59 grams. log. 2.656664

Grain = 0.0648 grams. log. 8.811576

TABLE II.

ACCELERATION OF GRAVITY.

g = 980.6056 — 2.5028 cos 2l — 0.000003h, where l is the latitude of the station and h its height in centimetres above the sea-level.

g at Washington = 980.07 | g at Paris = 980.94 g at New York = 980.26 | g at Greenwich = 981.17

TABLE III.

Units of Work.

Kilogram-metre = 100,000g ergs. Foot-pound = 18,8259 ergs. = 1.855 x 10^7 ergs, log 7.18200, when g = 980.

Units of RATE of WORKING.

Watt = 10^7 ergs per second. Horse-power = 550 foot-pounds per second,

746 Watts.

Unit of Heat.

Lesser calorie (gram-degree ) = 4.16 x 10^7 ergs.