Photo Gallery:   Inventions
 
The six major technological inventions of civilization    

  The six major technological inventions of civilization
   
March 10, 1876, a milestone in the invention of the telephone by Alexander Graham Bell, as shown in the design of the apparatus.    

  March 10, 1876, a milestone in the invention of the telephone by Alexander Graham Bell, as shown in the design of the apparatus.
   
The dawn of the transistor. Scheme  drawn in 1947 by Walter Brattain, one of  three  responsible for this historic invention. Other two were John Bardeen and William Schokley    

  The dawn of the transistor. Scheme drawn in 1947 by Walter Brattain, one of three responsible for this historic invention. Other two were John Bardeen and William Schokley
   
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