Definitionn. an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
Last update: October 10, 2015
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In 1854 he turned his attention to solar physics, and for the purpose of obtaining a daily photographic representation of the state of the solar surface he devised the photo-heliograph, described in his report to the British Association, "On Celestial Photography in England" (1859), and in his Bakerian Lecture (Phil. [Please select]
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For daytime signaling the United States Army favors the mirror or heliograph (sun-writing) system. [Please select]
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CHAPTER IV THE HOUSE OF THE HELIOGRAPH "You know your way about London." [Please select]
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A first-class heliograph is visible for a very long way, if the conditions are right. [Please select]
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Well, I guess that's because the heliograph is so much more secret. [Please select]
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You see, with the heliograph the flashes are centered. [Please select]
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Letters are formed by the puffs of smoke, just as we do the same with the wigwag flags, or the piece of looking-glass in the sun, when we heliograph. [Please select]
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