HELIOGRAPH
Adair's New Encyclopedia · 1923 · p. 5
signalling instrument that reflects sun’s rays by mirrors; range of 190 miles has been reached.
Bu kavram başka kaynaklarda da geçiyor
A Dictionary of Military Terms (1918)
Chamber's Twientieth Century Dictionary (1908)
The Optical Dictionary (1904)
Chandler's Encyclopedia (1898)
The Standart Electrical Dictionary (1892)
The Century Dictionary: The Encyelopedic Lexicon of the English Language (1887)
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