NUMBERS AND MEASURES. 21 



Acceleration due to gravity (g) at Greenwich in foot- 

 seconds 32-1908 



Length of the pendulum (I) beating seconds at 



Greenwich in inches 39*139 



A cubic foot of water at 39 F. weighs in pounds ... 62*415 



A cubic foot of water at 39 F. weighs in ounces 998*6 



Legal mass of a cubic foot of water at 62 F. in Ib. ... 62*321 

 Mass in Ib. of a cub. ft. of water at 62 F. calc. 



from Rossetti's results (cf. 32) 62*355 



A cubic inch of water at 62 F. weighs in grains 252*286 



A pound of water at 39 F. occupies in cubic feet ... '016022 



A pound of water at 62 F. occupies in cubic feet '016057 



A ton of sea- water occupies in cubic feet 35 



A ccm. of water at 4 C. weighs in grams (Kupffer).. 1 '000013 



Mass of a cubic foot of air at 32 F. in Ib 0*080728 



Mass of a litre of air at C. in grams 1'2932 



A pound of air at 62 F. occupies in cubic feet 13*14 



Height of the homogeneous atmosphere in feet 27801 



The normal pressure of the air (H) in mm. of mercury 760 

 The normal pressure of the air (H) in inches of 



mercury 29'922 



The normal pressure of the air (H) in kilogs. per scm. 1 '0333 



The normal pressure of the air (H) in Ib. per sq. inch 14*7 



Mass of a sovereign ( T V copper) in grains 123*274 



A halfpenny one inch in diameter weighs in oz. ...... *2 



A penny of an ounce weighs in grams 9*46 



Logarithm of n 0*49715 



A radian per second in turns per second 0*159155 



A turn per second in radians per second 6*2832 



