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"The thing that I'm most interested in at the moment is the so-called Infinite Energy solution - the possibility of finding new ways of tapping into virtually limitless sources of energy."
- Arthur C. Clarke

Electelscope  
  Telescope uses electronics applied to optics.  

In their electelscopes a far-flung shimmer had appeared across the blackness of space and they had leaped to send warning of the one unconquered menace that harried the spaceways. An ether eddy!
Technovelgy from The Cavern of the Shining Pool, by Leo Zagat.
Published by Thrilling Wonder Stories in 1937
Additional resources -

The images are shown on a view-plate:

For I had kept my eyes on the electelscope viewplate as we talked, and just then, the Phobos having completed a circuit of the red planet, the black peak came into its field. And I had caught a flicker of movement on its surface.

He uses this idea again in 1943, with a bit more detail:

"What do you make of this, Toom?" He seemed not to have heard me, so absorbed he was in the sternward view-screen. I reached him. "Five degrees gamma of Terra." He told me where to look.

A star was missing, out of Draco.

"I see. Thuban's blotted out."

"Has been for the last five minutes."

"So there's a meteor moving along the straight line between us, either away from, or following us."

"Following us." Rade's voice was so tense it thrummed. "And not a meteor. Take a look through the electelscope."

Karsdale's remarkable application of electronics to optics that in the space of a tube no larger than a man's arm reduces the apparent distance of an object to one-tenth the actual, was already switched in, but the thing that obscured Thuban must have moved since Rade focused it. I twirled thumbscrews until I got it clear again.

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Additional resources:
  More Ideas and Technology from The Cavern of the Shining Pool
  More Ideas and Technology by Leo Zagat
  Tech news articles related to The Cavern of the Shining Pool
  Tech news articles related to works by Leo Zagat

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