File:Signaling by Napoleonic semaphore line.jpg
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Summary
| Description |
English: Illustration of communication by mechanical semaphore in 1800s France. Lines of towers supporting semaphore masts were built within visual distance of each other. The arms of the semaphore were moved to different positions, to spell out text messages. The operators in the next tower would read the message and pass it on. Invented by Claude Chappee in 1792, semaphore was a popular communication technology in the early 19th century until the telegraph replaced it. |
| Date | |
| Source | Retrieved June 11, 2014 from Radio News magazine, Ziff-Davis Publishing Co., Inc., New York, Vol. 32, No. 5, November 1944, p. 71 archived on http://www.americanradiohistory.com/ |
| Author | The drawing is signed "Keith Thomas" in lower right corner |
| Permission (Reusing this file) |
This image is from an advertisement by Universal Microphone Co. without a copyright notice published in a 1944 magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3, "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain. |
Licensing
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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:12, 2 April 2015 | | 1,075 × 912 (265 KB) | wikimediacommons>Chetvorno | User created page with UploadWizard |
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