20 



ZOOPUAXOGRAPHY 



the back of the exposing motor; other binding posts 

 are arranged for return or other currents. 



Figure^T illustrates a front and side view of the 

 upper part of the exposing motor. Fastened to the 

 frame is a ring of hard rubber, in which are inserted 

 twenty-four insulated segments of platinum-coated 



iiiiiiij^^ 



Fig, 6. 



brass; these segments are connected by insulated wires 

 to the twenty -four binding posts on the back of the 

 motor table, figure 6. 



A shaft, connected by an arrangement of geared 

 wheels to the drum, passes through the center of the 

 segmented ring and carries a loose collar; a stout metal 



