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Scientific American, Vol. 67, No. 7 (August 1892) (1892)

leaf 4

An illustration from Scientific American, Vol. 67, No. 7 (August 1892), 1892, leaf 4
Captain James reminded his hear- thieves are made to set in operation the apparatus which is the means of their identification and capture. tate the use of the weapon as a single loader ; and the ers that he delivered a lecture on a similar subject five bore should be sufficiently small to enable a… … spindle carrying at the top a roughened 100 feet. disk, the electro-magnet being connected These wheels are at present operating Fig. l.-THE PHOTO-DETECTIVE. with a detent which engages an arm on the three Edison dynamos of 80 kilowatts each, vertical spindle. In a spring-pressed holder is placed…

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