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"It was my preferred entertainment when I was a kid, so when I set out to be a writer, it was perfectly natural that I should write the sort of stories that I used to enjoy reading."
- John Brunner

Zed-Ray  
  A penetrating beam that would disclose the details inside of a closed object.  

Wouldn't it be great to "shine a light" into an enclosed space, and see everything inside without opening it?

Then a penetrating, revealing Zed-ray, which would disclose the interior of the dome-buildings.
From Blood of the Moon, by Ray Cummings.
Published by Thrilling Wonder Stories in 1936
Additional resources -

Compare to the eavesdropping ray from Brigands of the Moon (1930) by Ray Cummings and the subphoton search ray from The Shining One (1937) by Nat Schachner. See also this real-life device in LEXID Sees Through Walls To Next Apartment.

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Additional resources:
  More Ideas and Technology from Blood of the Moon
  More Ideas and Technology by Ray Cummings
  Tech news articles related to Blood of the Moon
  Tech news articles related to works by Ray Cummings

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