Documents
History tlc
History telegraph
History telephone
History radio
History TV
History comp.
 
Scientists index
Bibliography
 

   


   

Henry Harrison Chase Dunwoody


  

  Highland County, Ohio 1842-1933
 
1906 Detector to carborundum (Silicon carbide)




 
       
HC Dunwoody American patents the radio detector crystal with carborundum, an essential element for the new industry of wireless telegraph. One of the first components for the detection of radio waves, the crystal carborundum allows the current entry in one sense , so that only the top half of the EU modulated get through.  The work of Dunwoody on a crystal enabled the first radio amateurs to build the first receivers and hear radio previews. The carborundum is composed of silicon carbide and other materials.
       





  
Documents


US Patent 837,610 Wireless telegraph system 04 Dec 1906