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"Building one space station for everyone was and is insane: we should have built a dozen."
- Larry Niven

Invisibility Magnets  
  They can cloak a space ship by bending light around it.  

"...The battle fleet will blow you to nothingness."

"Yorrick's fleet proceeds calmly along. It suspects nothing. You forget my ship is equipped with invisibility magnets to bend the light around us."

From Redmask of the Outlands, by Nat Schachner.
Published by Astounding Science Fiction in 1934
Additional resources -

Here are the details:

"Super powerful magnets deflect the light waves that flow toward the ship, cause them to bend around and meet again on the other side. Which means that there can be no reflected light from the ship to provide visibility, and no void in space to show as a blank spot. It also means that no light waves from the outside can come into the ship, or impinge on our retinas, so that while we cannot be seen, neither can we see."

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

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Additional resources:
  More Ideas and Technology from Redmask of the Outlands
  More Ideas and Technology by Nat Schachner
  Tech news articles related to Redmask of the Outlands
  Tech news articles related to works by Nat Schachner

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