20 



NUMBERS AND MEASURES. 



7/0 means 0000000. 



(24) MISCELLANEOUS DATA IN NUMBERS AND MEASURES. 



Base of Naperian logarithms (e) 2718282 



Modulus of common logarithms (M) 0'434294 



Reciprocal of modulus 2 "302585 



The "poundal" or British absolute unit of force is 

 the force required to generate per second a velocity 



of 1 ft. per second at Greenwich in oz 0*497 



A foot-pound in kilogram-metres 0*138254 



An inch-ton in kilogram-metres 25'8^ 



A kilogram-metre in foot-pounds 



A " horse-power " can work per second foot-pounds.. 550 

 A " force de cheval " can work per second kilogram- 

 metres 75 



A ' ' Watt " can work per second foot-pounds 



A horse-power in forces de cheval 



A force de cheval in horse-powers '98633 



