American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 258
aws the little metallic wedges that completedthe circuit, and thus discharges the alarm bybreaking it within the safe. It must now beshown how the slightest puncture of the shell,by admitting the air, will do the same thing bymaking a short circuit within the shell, inde-pendent of the alarm, and… … exactly beneath the brass disk previously de-scribed ; it was also shown that a wire laidacross each of these going and returning cur-rents formed a bridge, beyond which the cur-rents would not go, because through it a shortroad back to the battery was found withoutgoing the long circuitous route…
Clocks and watches
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