One of the mysteries of the English language finally explained.
1A signalling device by which sunlight is reflected in flashes from a movable mirror.
- ‘Although visual signaling - wigwag, sun-powered heliograph, and observation balloons - remained important to the U.S. military, the Spanish-American War found commercial and military telegraph enjoying extensive use.’
- ‘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.’
- ‘A heliograph was a communications system consisting of two mirrors on a tripod used to flash signals with sunlight.’
- ‘Later, runners, telegraph, semaphore, heliograph and line were used to communicate.’
- 1.1 A message sent by heliograph; a heliogram.
2A telescopic apparatus for photographing the sun.
3historical A type of early photographic engraving made using a sensitized silver plate and an asphalt or bitumen varnish.
- ‘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.’
- ‘An earlier version of the heliograph known as the heliotrope was used during the American civil war.’
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.’
- ‘In that small boat was the man to whom the signal had been heliographed.’
- ‘The besieged soldiers, using shaving mirrors, heliographed messages to their comrades based at Fort Pearson near the mouth of the river.’
- ‘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.’
2historical Take a heliographic photograph of.‘he could only heliograph static subjects in very intense light’
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