Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 177
flies back in contact with S, due to the spring inthe vibrator. As long asthe button is held down,this operation is repeatedagain and again, causinga steady ringing of thebell. A buzzer is simply adoorbell with the bell leftoff. The buzzing soundis made by the vibrator. 200. The TelegraphSounder. —… … Figure 160. — Wiring Diagram cfElectric Doorbell.
Physics
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