POLLsTfl 47 



the sides of the groove, and not on the bottom, so that 

 and has therefore a good hold of the pulley. 

 Tho diameter of the pulley should not be leas than 90 

 the diameter of the rope. Two pulleys connected by 



loss than thirty feet apart from centre to centra, 

 :i<ctanoemay be as much as 100 feat 



ExKacim 44 : Sexton of Rim of Rope 

 lie, the lection of the rim of rope pulley shown in fi 



w, half 



111- \\ 



irtaffc. Let two nnooth rnllort be 



placei *li t IK ir axes parallel, ami let one of them 



rotate \ there is no slipping the other 



roller will rotate in the opposite .1 same 



the diameters of 



ir speeds in ivxolutioi, followsas 



in U-lt ^i-a 



N h 



N - |. 



1) there be considerable resistance to t u of the 



follower slipping may take place, and it may stop. To prevent 

 this the rollers may be provided with teeth ; th-n th.-y Income 

 t/nr ir/.^/ il... teeth be so shaped that the r 



the speeds of the toothed rollers at any instant is the same as 



