

EXAMINATION PAPERS. 
303 



air per cubic foot, is 565 grains at the freezing point, and at a pressure of 14 692 lbs. per square inch. Now 14692 lbs. = 14 692 X 7,000 grains, and therefore 14692 lbs. per square inch is equivalent to 14'692 X 7000 X 144 grains per equare foot. Thus our formula— 



v = ■/ 
P X 141 

D 



becomes V = J 14692 X 7000 X 144 X * X 141
565
and taking^ =: 32 186 (introduced to express P in dynamical units) we get y _ /X4 692 _{x} 7000 X 144 X 32 186 X 1'41
565 


