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"This is a predictive tool I've used: There are goals we've sought for ten thousand years, and we'll go on seeking them. Instant transport and travel, immortality (or at least longevity and miracle cures.), instant learning …"
- Larry Niven

Sun Plant (Solar Motor)  
  A huge system of mirrors collects light and focuses it on a boiler for energy.  

This is an early version of this idea. It turns out that there was a civilization in Io, a large moon of the planet Jupiter.

The thousands of reflecting mirrors of that solar motor, mounted on their slanted, circular frame, were collecting the feeble rays of the tiny, far-distant sun, and concentrating them on the blackened boiler at the center of the frame. The boiler was made like a squatting image of one of those last natives. It had a great beard, carved out of iron, ruby eyes, long goblin nose and ears, and a strange, mocking, secret grin on its lips - a grin that was sinister in itself...


('The Lotus-Engine' by Raymond Z. Gallun)

So, we'd polished the reflecting mirrors of the sun-plant. We'd patched and repairs the leaks and dents in the boiler, turbine, and other parts. We'd filled the dried-out boiler from our ship's precious supply of water. We'd applied oil liberally, where necessary. Just at evening we'd got that huge, tip-tilted reflector frame turned around on its pivot, so it would face the sun at dawn.

And now, coming back from our ship in the early afternoon, we were flabbergasted to see that the world-old engine already in operation, its throttle evidently opened by an automatic device!

...As the hours went by, a gear-system became active on its pivot and gimbals, keeping the great, iron ring and its mirrors faced toward the sun, so as to collect all the heat possible for the boiler.

Technovelgy from The Lotus-Engine, by Raymond Z. Gallun.
Published by Super Science Stories in 1940
Additional resources -

Compare to the sun-engine from Valley of Lost Souls (1939) by Eando Binder.

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Additional resources:
  More Ideas and Technology from The Lotus-Engine
  More Ideas and Technology by Raymond Z. Gallun
  Tech news articles related to The Lotus-Engine
  Tech news articles related to works by Raymond Z. Gallun

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