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    The Message From Space by  David M. Speaker: 
      Science Fiction Inventions, Technology and Ideas
    "Great strides in the field of photo-electrics have been attained through the use of selenium. That does not mean, however, that there might be no other element in existence with stronger photo-electric properties than selenium—strong enough, perhaps, to make possible enormous distance radio communication. If any of the planets arc inhabited by intelligent beings, or forces, or whatnot, interplanetary radio communication might become an actuality when such an element is discovered. Mr. Speaker is well known to our readers. In this story he 
combines excellent writing with plenty of science of unusual interest."
  
  
(From 'The Message from Space' by David M. Speaks)
 Select
      an invention: 
    
         Planet City  A planet the surface of which is entirely covered over, forming one single city.
           
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         Space-Phone  A device for communicating with space ships, both ship-to-ship and ground-to-ship.
           
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         Visiphone  Visual as well as audio communication.
           
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Technovelgy.com is devoted
      to the creative inventions of science fiction authors and movie makers. Look
      for the Science Fiction Invention Category that
      interests you, the Glossary of Science Fiction
      Inventions, the Timeline of Science Fiction
      Inventions, or see what's New. 
  Find new authors and technologies - Shop for yourself,
  your library and your lab. 
  
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