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"Individual science fiction stories may seem as trivial as ever to the blinder critics and philosophers of today -- but the core of science fiction, its essence has become crucial to our salvation if we are to be saved at all."
- Isaac Asimov

Rocket Side Tubes  
  An early description of attitude jets, course correction by small emissions of gas.  

This is an early use of this concept, usually called a reaction control system (RCS); it's a spacecraft system that uses thrusters to provide attitude control.

Left alone in the pilot-house, Evans sat at the control-board with eyes glancing from one to another of the recording dials above it. Now and then he depressed a firing-lever, firing one of the rocketís side tubes to keep it from leaving its proper space-lane, but for the most part the great craft hurtled steadily onward in its course, and he occupied himself in contemplating through the windows the moonís bright sphere and the dazzling light-patches on it that marked the position of the lunar cities.
Technovelgy from Evans of the Earth-Guard, by Edmond Hamilton.
Published by Air Wonder Stories in 1930
Additional resources -

Compare to the emergency corrective rockets from The Emperor of the Stars (1931) by Nat Schachner (w. AL Zagat) and the handheld personal rocket jet from Space Cadet (1948) by Robert Heinlein.

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Additional resources:
  More Ideas and Technology from Evans of the Earth-Guard
  More Ideas and Technology by Edmond Hamilton
  Tech news articles related to Evans of the Earth-Guard
  Tech news articles related to works by Edmond Hamilton

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