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"Self-education is, I firmly believe, the only kind of education there is."
- Isaac Asimov

Electric Diaper  
  A diaper that will indicate when it is wet.  

In this excellent novella-length story, Dr. Keller needs a diaper that signals wetness, in order to notify the Psychophonic Nurse taking care of the baby.

"...suppose the baby gets wet between times? Suppose it starts to cry?"

"I've thought of that, too. In every diaper there is a fine copper wire. When that becomes wet a delicate current is sent - you understand I mean an electrical current, not a watery one - to an amplifier and a certain sound is made, and the nurse will properly react to that sound..."

From The Psychophonic Nurse, by David H. Keller.
Published by Amazing Stories in 1928
Additional resources -

The Psychotronic Nurse is basically a robot or automaton that is able to perform different functions; however, it requires an audible signal to perform a function.

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Additional resources:
  More Ideas and Technology from The Psychophonic Nurse
  More Ideas and Technology by David H. Keller
  Tech news articles related to The Psychophonic Nurse
  Tech news articles related to works by David H. Keller

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