large ex- tually as if the whole six wires of the cable were cut. tween the protector case and the alarm apparatus, which is As a closed circuit is employed, it is necessary to separate pense is incurred to so pile plate upon plate, and to temper shown in our engraving, attached to the front of the… … ted in the battery, magnets that pre- DUNCAN & HOWELL'S ELECTRO-PNEUMATIC PROTECTOR FOR SAFES AND VAULTS. passes through the viously held them, battery wire to one of the strips of copper: then—when the The ends of the copper strips, opposite the wedge on the unlock a train of clockwork placed in a…
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