16 



ZOOPRAXOGRAPHY 



slior 



To the lower rod of the front aperture is fastened 

 a ring C and a cleat, to which some elastic rubber 

 bands B are attached; these bands are easily removable 

 and their number increased at discretion; in some 

 instances of rapid exposures a tension of twenty-five 



pounds or more was 

 required. On a shelf 

 of the frame is a 

 magnet M, over the 

 top of which is 

 arranged a steel 

 lever G pivoted near 

 the end D which 

 terminates with a 

 htly indented 

 projection. 



The armature of 

 the magnet is pivoted 

 at H ; its upper arm 

 terminates with a 

 shoulder I. S is a 

 spring to prevent 

 the accidental shift- 

 ing of the shoulder 

 from its contact with 

 the lever when the 

 exposor is ready for 

 Fig. 2. its function. N is a 



set screw to adjust the distance of the armature from 

 the magnet. To prepare for a series of photographic 

 exposures — the plates having been already placed in 

 the cameras — the end of the lever G is placed under 



