92 



THE SCREW. 



turn is 3-1416 x O36 = l m '130976. If the end of the 

 handle be turned with a force of 5 kgr , the work done 

 during one revolution is 5 x 1*130976 = 5'65488 kilo- 



grammetres. The force with which the cylinder 

 downwards is therefore -- 8 =565 kgr '488. 



The relation of the forces is very variable in the 



