150 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



Fig. 153. 



The above cut (Fig. 158) represents a set of mechanic 

 powers, in which arrangement a few of the articles are 

 modified, having the four most important systems of pulleys 

 arranged as those described, and having two straight levers 

 on the frame, and one bent lever, and a movable pulley at- 

 tached to a brass pillar with a nut on the bottom, by which 

 it can be shifted to different holes in the top of the frame, 

 for passing the cord over, in using the lever in the second 

 and third order, and also for the bent lever ; the inclined 



