A Universal Microtome, 



285 



therefore at right angles to each other, but do not intersect. At a 

 point which we will call tlie " feed point " a projection on the feed 

 lever intersects the vertical axis of the knife edges of the swinging 

 arm and engages with this arm through a special connecting pin 



Fig. 2. 



described below. It will be clear that if this feed point be between 

 the feed nut and the fulcrum of the feed lever it will rise as the 

 feed nut rises and carry the swinging arm with it. In this micro- 

 tome the feed point is considerably nearer to this fulcrum than to 

 the feed nut, and consequently the swinging arm has less vertical 



