Photo-electric Alarm
Hawkins' Electrical Dictionary · 1915 · p. 3
—An alarm operated by a selenium cell by which a bell is rung when the cell is exposed to the action of light.
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A Dictionary of Scientific Terms (1927)
electric alarm
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The American Dictionary and Cyclopedia (1910)
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Chamber's Twientieth Century Dictionary (1908)
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The Student's Medical Dictionary (1896)
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