Category:Optical telegraphy: Difference between revisions
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[[Image:Optical Telegraph Old Prussian Optical Telegraph Attribution.jpg|thumb|right|A replica of the controls on a Prussian Optical Telegraph - Image by Super Bass]] | |||
A system of conveying information by visual signals, usually using towers with flags or shutters | |||
[[Category:Telegraphy|{{PAGENAME}}]] | |||
Latest revision as of 21:24, 14 January 2013
A system of conveying information by visual signals, usually using towers with flags or shutters
Pages in category "Optical telegraphy"
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Media in category "Optical telegraphy"
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Optical Telegraph Old Prussian Optical Telegraph Attribution.jpg 1,468 × 2,570; 884 KB
