132 MR. DAVIES GILBERT ON IMPROVEMENTS IN STEAM ENGINES. 
If N = the number of revolutions in a minute, the product found as above 
must be divided by 60 x 60 = 3600 ; consequently F = r N 2 X 
0.00034078 (log. 6.5324732.) 
For an approximate value, 
The centrifugal force == the radius x number of revolutions in a minute 
squared x 34 and cutting off live places of figures. 
