Popular science monthly . Spring be found. The co\eris so arranged that itcannot be blown offuntil the powder isburning with its great-est brightness. When the wire to thebait is pulled, the pow-der is ignited and com-mences to burn. For asmall fraction of asecond the cover re-mains in place whilethe powder , when the powderis burning with greatest\igor and is gi\ing offits brightest light, thecover is blown off andthe shutter of the cam-era is Below, the animal attractedto the bait, which is at-tached to a trigger whichreleases the firingpin which is fastened to atree or
Popular science monthly . Spring be found. The co\eris so arranged that itcannot be blown offuntil the powder isburning with its great-est brightness. When the wire to thebait is pulled, the pow-der is ignited and com-mences to burn. For asmall fraction of asecond the cover re-mains in place whilethe powder , when the powderis burning with greatest\igor and is gi\ing offits brightest light, thecover is blown off andthe shutter of the cam-era is Below, the animal attractedto the bait, which is at-tached to a trigger whichreleases the firingpin which is fastened to atree or post supportingthe lamp. This is U>prevent the ex|)losionof the powder fromblowing the cover sofar away that it cannot The wiring arrangement,showing the flash occurringat the very instant the baitis touched by the animal Sonu-times two setslit cameras and are used to giveiwn ]>i(iures of thesame animal in differ-ent positions, beforeand after his fright. Popular Science Mont/il// 485
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
