48-1 



pulls the trigger, re- 

 leases the firinji-pin and 

 ignites the powder by 

 exploding the blank 

 cartridge. When the 

 powder is to be ignited 

 electrically, a wire is 

 stretched from a switch 

 to the bait. Once the 

 bait is touched a circuit 

 is closed and an elec- 

 tric spark sets off the 

 powder. 



The shutter on the 

 camera designed by 

 Mr. Nesbit is operated 

 by means of the cover 

 placed over the con- 

 tainer holding the pow- 

 der. This cover is 

 attached to a chain 



Popular Science Monthly 



Cover 



Spring 



be found. The co\er 

 is so arranged that it 

 cannot be blown off 

 until the powder is 

 burning with its great- 

 est brightness. 



When the wire to the 

 bait is pulled, the pow- 

 der is ignited and com- 

 mences to burn. For a 

 small fraction of a 

 second the cover re- 

 mains in place while 

 the powder burns. 

 Then, when the powder 

 is burning with greatest 

 \igor and is gi\'ing off 

 its brightest light, the 

 cover is blown off and 

 the shutter of the cam- 

 era is siKipprd. 



Below, the animal attracted 

 to the bait, which is at- 

 tached to a trigger which 

 releases the firingpin 



which is fastened to a 

 tree or post supporting 

 the lamp. This is U> 

 prevent the ex|)losion 

 of the powder from 

 blowing the cover so 

 far away that it cannot 



The wiring arrangement, 

 showing the flash occurring 

 at the very instant the bait 

 is touched by the animal 



Sonu-times two sets 

 lit cameras and ilash- 

 l.iinps are used to give 

 iwn ]>i(iures of the 

 same animal in differ- 

 ent positions, before 

 and after his fright. 



