. Popular electricity magazine in plain English. Heater Arrangement for Printing Presses. combination lock by listening to clicksas the dial is revolved. But in the case ofsome types of combination lock, thiswould appear to be possible, and our Pariscorrespondent sends the following de-scription of a microphone transmitterwhich was actually used to enable theburglar to turn the trick. The illustrations show the apparatusand method used with a type of combina-tion lock having four different buttons,each button carrying letters around itsrim so that the right letter needs to be setopposite a mar
. Popular electricity magazine in plain English. Heater Arrangement for Printing Presses. combination lock by listening to clicksas the dial is revolved. But in the case ofsome types of combination lock, thiswould appear to be possible, and our Pariscorrespondent sends the following de-scription of a microphone transmitterwhich was actually used to enable theburglar to turn the trick. The illustrations show the apparatusand method used with a type of combina-tion lock having four different buttons,each button carrying letters around itsrim so that the right letter needs to be setopposite a mark, upon all the four but- POPULAR ELECTRICITY and the WORLDS ADVANCE 1141 tons. In turning a button, there is aslight click produced, just when the cho-sen letter passes in front of the stop piecewhich it operates, but it is almost impossi-ble to hear this from the outside, althougha person who has an exceptionally finesense of hearing may be able to work the• lock by the ear alone. But it is quite aneasy matter to hear the sound by usinga microphone transmitter, which enablesone to
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectri, bookyear1912
