Difference between revisions of "Heliograph"

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(Created page with "Heliograph - wireless solar telegraph that signals by flashes of sunlight http://en.wikipedia.org/wiki/Heliograph Category:400BCE Category:Unfinished [[Category:Book Pag...")
 
(No difference)

Latest revision as of 02:31, 8 June 2012

Heliograph - wireless solar telegraph that signals by flashes of sunlight http://en.wikipedia.org/wiki/Heliograph