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"the [science fiction] writer should be able to convince the reader (and himself) that the wonders he is describing really can come true...and that gets tricky when you take a good, hard look at the world around you."
- Frederik Pohl

Spacecraft Invisibility Electronics  
  A means of rendering a spacecraft invisible to detection by electromagnetic means.  

A tiny ship, however, was now driving outward from the sun, parallel to the ecliptic plane and two hundred million miles beyond the limits of the space-lanes. Its hull was covered with thin photo-electronic cells capable of being adjusted to absorb any desired fraction of the incident radiation—making the vessel, when they were in operation, virtually invisible in space.

Not thirty feet long, and weighing too few tons to have perceptible effect on the mass-detectors of a Legion cruiser beyond ten million miles, the ship had power to race the fleetest of them.

From One Against The Legion, by Jack Williamson.
Published by Astounding in 1939
Additional resources -

Compare to the invisibility shield from Triplanetary (1934) by EE 'Doc' Smith.

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Additional resources:
  More Ideas and Technology from One Against The Legion
  More Ideas and Technology by Jack Williamson
  Tech news articles related to One Against The Legion
  Tech news articles related to works by Jack Williamson

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