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"The germinal societies like Singapore and communist Hong Kong may give us a mutant capitalism that is both virulent and efficient. This is a significant cultural danger."
- Gregory Benford

Thermalarm Relays  
  Detects objects by their heat radiation, so space craft can maneuver around them.  

"Suppose a big rock gets through your safety-field?"

"We've got another gadget, for the big ones," Drake assured him. "The heat radiation of anything larger than a pea will trip the thermalarm relays, in time for the pilot-robot to change our course."

"Satisfied, brother?" Mike Moran rapped his crutch on the deck. "Better be!"

Technovelgy from Collision Orbit, by Jack Williamson.
Published by Astounding in 1942
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