单词	heliograph
释义	heliograph /ˈhiːlɪə(ʊ)ɡrɑːf / noun 1A signalling device by which sunlight is reflected in flashes from a movable mirror.A heliograph was a communications system consisting of two mirrors on a tripod used to flash signals with sunlight.... When we all got back to camp, our General communicated by heliograph from a distant mountain top with his superiors. Organised divers always carry some means of signalling their position at the surface, whether it be air-horn or flag, flare or heliograph, or combinations of two or more. 1.1A message sent by heliograph; a heliogram. 2A telescopic apparatus for photographing the sun. 3 historical A type of early photographic engraving made using a sensitized silver plate and an asphalt or bitumen varnish.An earlier version of the heliograph known as the heliotrope was used during the American civil war.... The researchers used infrared spectrometry to analyze the heliograph's bitumen layer, too. The heliograph, ‘View From the Window,’ will be on view at the Ransom Galleries in Austin, Texas. verb [with object] 1Send (a message) by heliograph: the glasses seemed to be heliographing a warning... Garfield, just over the shoulder of Bond, was another, and it seemed as if the two were heliographing one to another from golden mirrors. To continue with my trip, the remainder of the summer was spent in patrolling, keeping weather reports, heliographing and reporting fires. Many in your Lordships’ House will be familiar with the story told in James and Jan Morris's great imperial trilogy, of the outpost in Sudan which heliographed to Khartoum. 2 historical Take a heliographic photograph of: he could only heliograph static subjects in very intense light Derivatives heliographic /ˌhiːlɪə(ʊ)ˈɡrafɪk / adjective ... Flag, semaphore, and electrical or heliographic Morse signalling were all susceptible to interception by the enemy and thus dependent on codes and ciphers. Three methods to determine the heliographic latitude and longitude of sunspot groups are described below. heliography /hiːlɪˈɒɡrəfi / noun ... A unique solar application that Lea teaches is heliography or sun printing. Bugles, flags, and heliography technology have advanced the means of control available to commanders. And to this day, the discoveries of heliography continue to impact art, and art education.
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