File:SEMAPHORE TELEGRAPH TOWER AT CHATNA IN BANKURA..webm
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Size of this JPG preview of this WEBM file: 800 × 450 pixels. Other resolutions: 320 × 180 pixels | 640 × 360 pixels | 1,280 × 720 pixels.
Original file (WebM audio/video file, VP8/Vorbis, length 7 min 33 s, 1,280 × 720 pixels, 2.64 Mbps overall, file size: 142.41 MB)
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English: Know about Semaphore telegraph tower as Amitabha Gupta, a renowned blogger, gives a detailed description of it. A semaphore telegraph is a system of conveying information by means of visual signals, using towers with pivoting shutters, also known as blades or paddles. Information is encoded by the position of the mechanical elements; it is read when the shutter is in a fixed position. The most widely used system was invented in 1792 in France by Claude Chappe, and was popular in the late eighteenth to early nineteenth centuries. |
| Date | |
| Source | YouTube: SEMAPHORE TELEGRAPH TOWER AT CHATNA IN BANKURA. – View/save archived versions on archive.org and archive.today |
| Author | Suvadip Sanyal |
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Attribution: Suvadip Sanyal
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This file, which was originally posted to YouTube, was reviewed on 6 December 2019 by the automatic software YouTubeReviewBot, which confirmed that this video was available there under the stated Creative Commons license on that date. This file should not be deleted if the license has changed in the meantime. The Creative Commons license is irrevocable.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:05, 16 February 2018 | 7 min 33 s, 1,280 × 720 (142.41 MB) | SuvadipSanyal (talk | contribs) | Imported media from https://www.youtube.com/watch?v=Ok5bc8p4Bng |
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