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"Conspiracy theories are big because they're comforting. Any conspiracy is infinitely less multiplex than the real deal, which is multiplex to the point of being unknowable."
- William Gibson

Sono-Induction Coils  
  A public address system consisting of buried coils.  

Never give anything away to the nearby enemy; that's the first rule of successful trench warfare.

A rasping, angry voice burst among the quarreling men in Frontline Trench X 32 like a Dongan shell. "Stop that racket, men! Another sound and the entire trench will be shot."

The loud discussion died suddenly; they looked at each other sheepishly. It was the voice of the brigade commander, three miles in the rear and one hundred feet underground. It came through sono-induction coils, vibrated within the circumscribed area of the trench. Outside that area not a whisper could be heard.

From The Shining One, by Nat Schachner.
Published by Astounding Science-Fiction in 1937
Additional resources -

I'm fascinated by the fact that, twenty years after WWI ended, science fiction writers were still trying to figure out a better way to fight it.

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Additional resources:
  More Ideas and Technology from The Shining One
  More Ideas and Technology by Nat Schachner
  Tech news articles related to The Shining One
  Tech news articles related to works by Nat Schachner

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