306 



APPLIED SCIENCE 



contact with the pulley, and by the coefficient of friction 

 between the belt and the pulley. Consequently, the position of 

 link 5 may be taken as known. The intersection of the driving 

 link 1 with 5 gives joint B ; the third force acting on b is the 



d. slack 



resultant of the two others, and must pass through the centre 

 of the pulley b; this determines the direction of link 2. Simi- 

 larly, C is given by the intersection of 5 and 6 ; link 4 is drawn 

 from their intersection to the centre of the pulley o; the 



