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"[Science fiction is] nightmares and visions, always outlined by the barely possible."
- Gregory Benford

Gyro Two-Wheeled Truck  
  A gyroscopically-stabilized truck with just two wheels.  

Now Alexander saw that the two-wheeled truck was still waiting, backed up to the loading platform...

The Gyro was one of the air-driven Robling types, very simple, vey reliable, the flywheel driven by a tiny stream of air impinging on the peripheral turbine blades. Once it was in motion, very little air was needed to keep the heavy rotor turning at a high enough velocity to stabilize tha truck.

From The Sign of the Tiger, by Alan Nourse (w/Meyer).
Published by Amazing Science Fiction Stories in 1958
Additional resources -

Compare to the tumblebugs from Robert Heinlein's 1940 novella The Roads Must Roll.

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Additional resources:
  More Ideas and Technology from The Sign of the Tiger
  More Ideas and Technology by Alan Nourse (w/Meyer)
  Tech news articles related to The Sign of the Tiger
  Tech news articles related to works by Alan Nourse (w/Meyer)

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