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"[Science fiction] is the only kind of writing that allows you to look at the world we live in and change one piece at a time."
- Frederik Pohl

Death Projector  
  Wide angle Ray of death!  

"Look at these models carefully," said Clason. "They represent two of the most remarkable discoveries of all time. The one on your left is the most destructive weapon known to man. The other I consider the most constructive discovery in the history of science. It may even lead to an understanding of the nature of life, and of the future of the spirit after death.

"Both of these were developed by my brother Philip and me together—but we have disagreed about the use to which they shall be put.

"Philip"—the inventor dropped his voice to a whisper—"wants to sell the secret of the Death Projector—the tower, there—as an instrument of war. If I should permit him to do that, it might lead to the destruction of whole nations!"

"How?" demanded Quest "I've heard of a device called the Death Ray. Is this it?"

"No, no," said Clason contemptuously. "Even in a perfected state the Ray would be a child's toy compared to the Projector. This is based on our discovery that invisible light rays of a certain wave-length, if highly concentrated, destroy life—and our additional discovery that if these are synchronized with short radio waves the effect is absolutely devastating.

"We obtain the desired concentration of invisible light by using a tellurium current-filter under the influence of alternate flashes of red and blue light. The projector can literally blanket vast areas with death, up to a top range of at least five hundred miles.

"Just picture to yourself what this means! In a space of ten minutes two men can lay down a circle of destruction a thousand miles in diameter; or they can cut a swath five hundred miles long in any desired direction."

From The Stolen Mind, by M.L. Staley.
Published by Astounding Stories in 1930
Additional resources -

Early use of this idea:

"The point is that my brother is determined to sell if he can obtain his price for the invention. He argues that instead of bringing disaster upon the world, this machine will forever discourage war by making it too terrible for any civilized nation to consider."

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Additional resources:
  More Ideas and Technology from The Stolen Mind
  More Ideas and Technology by M.L. Staley
  Tech news articles related to The Stolen Mind
  Tech news articles related to works by M.L. Staley

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