Difference between revisions of "Heliograph"
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Caseorganic (Talk | contribs) (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...") |
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Latest revision as of 22:31, 7 June 2012
Heliograph - wireless solar telegraph that signals by flashes of sunlight http://en.wikipedia.org/wiki/Heliograph
