APPARATUS 



21 



rod is firmly attached near 



Fig. 7. 



of the battery; and 

 each segment — 

 throuo^h its inde- 

 pendent wire and 

 magnet of the 

 electro - exposors — 

 with the other pole. 

 When twenty- 

 four conse c u t i V e 

 phases of an act of 

 motion are to be 

 photographed from 

 one point of view, 

 all of the insulated 

 segments in the ring 

 are put in circuit. 



its longitudinal center tc 

 this loose collar. 

 One arm of the rod 

 carries a lami- 

 nated metal scraper, 

 or contact brush, 

 arranged to travel 

 around the periph- 

 ery of the ring, and 

 in its revolution to 

 make contact with 

 each segment in suc- 

 cession. The con- 

 tact brush is con- 

 nected through the 

 arm with one pole 



Fig. 7. 



When twelve consecutive phases 



