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"My feeling is that the chance of our surviving into the twenty-first century as working civilization is less than fifty percent but greater than zero."
- Isaac Asimov

Magnalloy  
  A durable form of magnesium.  

"This apparatus," Dr. Bird explained to the Signal Corps officer, who was an interested observer, "is one which was designed at the Bureau for the large scale production of ultra-violet light. There is nothing special about the generator except that it is highly efficient and gives an almost constant electromotive force. The current thus produced is led across these points, which are composed of magnalloy, a development of the Bureau. We found on investigation that a spark gave out a light which was peculiarly rich in ultra-violet rays when it was passed between magnesium points. However, such points could not be used for the handling of a steady current because of lack of durability and ease of fusion, so a mixture of graphite, alundum and metallic magnesium was pressed together with a binder which will stand the heat. Thus we get the triple advantages of ultra-violet light production, durability, and high resistance.
From The Cave of Horror, by S.P. Meek.
Published by Astounding Stories in 1930
Additional resources -

Compare to herculoy from The Howling Bounders (1949) by Jack Vance, ultron from Armageddon: 2419 A.D. (1928) by Philip Frances Nowlan, permalloy from Fugitives From Earth (1939) by Nelson S. Bond, helio-beryllium from Out Around Rigel (1931) by Robert H. Wilson, steelonium from Ralph 124c 41 + (1911) by Hugo Gernsback and plasteel from Dune (1965) by Frank Herbert.

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Additional resources:
  More Ideas and Technology from The Cave of Horror
  More Ideas and Technology by S.P. Meek
  Tech news articles related to The Cave of Horror
  Tech news articles related to works by S.P. Meek

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