File:Babbage sign language.jpg
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This is a file from the Wikimedia Commons. The description on its description page there is shown below.
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| Description |
English: w:Charles Babbage, description of a sign language for mechanical components. From On a method of expressing by signs the action of machinery (1827), |
| Date | |
| Source | https://archive.org/stream/philtrans09445034/09445034#page/n3/mode/2up |
| Author | Charles Babbage |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 12:56, 25 April 2013 | 384 × 451 (77 KB) | Charles Matthews | {{Information |Description ={{en|1=w:Charles Babbage, description of a sign language for mechanical components.}} |Source =http://archive.org/stream/philtrans09445034/09445034#page/n3/mode/2up |Author =Charles Babbage |Date ... |
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