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"This category [science fiction] excludes rocket ships that make U-turns, serpent men of Neptune that lust after human maidens, and stories by authors who flunked their Boy Scout merit badge tests in descriptive astronomy."
- Robert Heinlein

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

Electric Diaper-related news articles:
  - Solar Power Necktie (Clip-On Only)
  - Space Toilet Diaper From Japan
  - Exmobaby Biosensor Pajamas For Baby
  - iBag Urine Bag Tweets When Full
  - Smart Bra From First Warning Systems
  - Smart Diapers Help Spot Disease
  - 'Smart Sock' From Owlet Baby Care
  - Owlet Vitals, The Future Of Baby Monitoring
  - Mimo Baby Monitor
  - MC10 Electronics Skin Stickers

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Smart Fabric Can Harvest Energy From Sunshine And Motion
Fashion Needs To Step Up Technology Education

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