Fig. 223a. The Spencer Lens Company's New Table Micro- 

 tome for hand sectioning. The vertically moveable socket which 

 holds the object clamp is held by hardened steel pivot screws in 

 two vertically swinging arms similarly attached to the main frame, 

 providing a movement upon the parallelogram principle, regulated 

 by micrometer screw with graduated disc and index plate. Glass 

 surface plates for travelling ways for the knife. 



