Use Your Phonograph as an Alarm Clock - Popular Science 1932
USE PHONOGRAPH AS AN ALARM CLOCK
"A novel attachment for the phonograph by which a heavy sleeper may be aroused at any hour he wishes by soft music, was recently shown in London, England. The alarm-clock device is set at the desired hour, and wound. A brake on the turntable of the phonograph is released at the set hour by a slight pull from the alarm key of the clock."
Via Modern Mechanix
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