Protect babies with "mysterious power known as electricity" and "eye which never sleeps"

The need to "protect babies from kidnappers" inspired an inventor in 1934 to create the world's most perfectly hyperbolic nannycam:

ANOTHER use has been found for that mysterious power known as electricity, and this time it will find favor with all mothers. The photo-electric cell, popularly known as the "eye which never sleeps," has been mounted on baby's crib. It watches throughout the night, ringing an alarm the instant anyone tries to reach into the crib.

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