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  The Point-Contact Transistor
The first point-contact transistor consisted of a germanium crystal placed on a metal plate. The germanium was of n-type with a so-called p-type inversion layer. Pressing down on this crystal was a plastic wedge, which was kept in place by a modified paper clip. On this wedge a thin gold foil, cut in two halves with a razor blade, had been cemented. The slit was very important to be able to make this point-contact device to work.
 
     
   
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MLA style: "The Transistor". Nobelprize.org. Nobel Media AB 2014. Web. 21 Apr 2015. <http://www.nobelprize.org/educational/physics/transistor/function/pointcontact.html>

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