Category:Electrical telegraphy: Difference between revisions
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[[Image:Electric Telegraph Military Beardslee Telegraph Attribution.jpg|thumb|right|An electric telegraph developed by George Beardslee in 1862 - Image by Rebecca Robbins Raines and The U.S. Army Signal Corps ]] | [[Image:Electric Telegraph Military Beardslee Telegraph Attribution.jpg|thumb|right|An electric telegraph developed by George Beardslee in 1862 - Image by Rebecca Robbins Raines and The U.S. Army Signal Corps ]] | ||
The long-distance transmission of messages or information via electrical signals, usually over telecommunications lines or radio | |||
[[Category:Telegraphy|{{PAGENAME}}]] | [[Category:Telegraphy|{{PAGENAME}}]] | ||
Latest revision as of 21:21, 14 January 2013
The long-distance transmission of messages or information via electrical signals, usually over telecommunications lines or radio
Pages in category "Electrical telegraphy"
The following 6 pages are in this category, out of 6 total.
Media in category "Electrical telegraphy"
The following 2 files are in this category, out of 2 total.
Electric Telegraph Military Beardslee Telegraph Attribution.jpg 495 × 561; 168 KB
Fig05-SiemensKarolusFacsimileSystem1927 0622.jpg 1,731 × 2,170; 584 KB
