From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
List of useful physical and mathematical constants and unit conversions.
| Identifier | ExFiles\Box 77\5\ scan0007 | |
| Date | 19th May 1925 guessed | |
| X4572 USEFUL CONSTANTS. g = 32.2 ft./sec² = 981 cm/sec². 1 atmosphere = 14.7 lbs/sq.in. = 760 m/m = 2116 lbs/sq.ft. = 34 ft of water. 1 lb/sq.in. = .07031 kg/sq.cm. ENERGY. 1 ft.lb. = .1383 kg. metre = 1.356 X 10⁷ ergs. 1 Joule = 10⁷ergs = .7373 ft.lbs. 1 C.H.U. = 1,400 ft.lbs. 1 B. Th.U. = 778 ft.lbs. 1 Calorie. = 3.087 ft.lbs. = 2.205 C.H.U.s POWER. 1 watt. = 1 volt X 1 amp. = 10⁷ ergs/sec. = 1 Joule/sec. 1 K.W. = 1.34 HP. = .239 calories/sec. 1 Metric. HP. = .986 English H.P. = 75 kg.m/sec. MISC. 1 cu.ft. water weighs = 62.3 lbs. 1 cu.ft. air N.T.P. = .0807 lbs. 1 radian = 57.3º. Log eX = 2.3026 X log 10X e = 2.71828. Absolute zero. = -273ºC = - 459ºF.{Mr Friese} | ||