1940's diagram for a domestic electric doorbell system and an alarm bell.

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Size: 4289px × 5906px
Photo credit: © Colin Waters / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 12, 1940s, alarm, batteries, battery, bell, breaker, breaking, broken, button, carbon, circuit, contact, contacts, continuous, current, diagram, domestic, door, early, electricity, fashioned, historic, history, magnet, magnetic, magnets, platinum, push, return, ringer, ringing, stud, terminals, twelve, vibating, vibrating, vibrator, vintage, volt, wire, wires, wiring, zinc