Iceland Spar in Electricty History

[Ya Sam]

"1678  -  Christiaan Huygens introduces his famous construction and 
principle, thinks about translating his manuscript into Latin, then 
publishes it in the original French in 1690. He uses his theory to discuss 
the double refraction of Iceland Spar. His is a theory of pulses, however, 
not of periodic waves. "

http://www.electricityforum.com/electricity-history.html

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