Heliograph
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A heliograph (, meaning "sun", and , meaning "write") is a wireless solar telegraph that signals by flashes of sunlight (generally using Morse code) reflected by a mirror. The flashes are produced by momentarily pivoting the mirror, or by interrupting the beam with a shutter. The heliograph was a simple but effective instrument for instantaneous optical communication over long distances during the late 19th and early 20th century. Its main uses were military, survey and forest protection work. Heliographs were standard issue in the British and Australian armies until the 1960s, and were used by the Pakistani army as late as 1975.
| Heliography Heliography myweb.cableone.net/kd7aoi/ - Web |
| The Heliograph The Heliograph www.modulatedlight.org/Modulated_Light_DX/Heliograph.html - Web |
| Eliografo Eliografo www.morsekey.net/eliografo.html - Web |
Gallery for «Heliograph»
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| Australian War Memorial Australian War Memorial www.awm.gov.au/.../?q=heliograph&conflict=all&submit=Search - Web |
| Royal Signals Datasheet No. 2. The Heliograph (rev... Royal Signals Datasheet No. 2. The Heliograph (revised April 2003) home.arcor.de/royal-signals/page24/page26/page26.html - Web |
| CHAPTER IV THE HELIOGRAPH CHAPTER IV THE HELIOGRAPH home.arcor.de/royal-signals/page24/page28/page28.html - Web |
| Mance Mark V Heliograph Mance Mark V Heliograph www.prc68.com/I/MkVHeliograph.shtml - Web |
| The Heliograph in the Apache Wars The Heliograph in the Apache Wars www.discoverseaz.com/History/Heliograph.html - Web |
| Signals communication in the South African War 189... Signals communication in the South African War 1899-1902 samilitaryhistory.org/vol111jh.html - Web |
| Superaldis, an Heliograph / Aldis lamp simulator Superaldis, an Heliograph / Aldis lamp simulator home.no.net/fenja256/superaldis - Web |
