LIFTS AND HOISTS 



743 



Thus, if a = acceleration of ram and cage in feet per second per second 

 we have. 



Force necessary to produce ) 2 x 2,240 



,, i ,. ' [ = - X a IDS. 



this acceleration J g 



FIG, 360. Direct- Acting Hydraulic Hoist. 



And if F = force in Ibs. necessary to overcome friction of ram we have 



4,480 { 1 + } + F 

 area of ram = 



750 



