1. 
   Weston cadmium cell
   (from the article `battery`) ...other cell types are in use on a small scale. For example, cells that produce a very predictable standard voltage are the Clark cell ... ...gives the value of the voltage. Before the Josephson method was used, the voltage standard in metrological laboratories devoted ...
   Found op http://www.britannica.com/eb/a-z/w/27
   
   

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