File:Union cipher disk.jpg
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Summary
| Description |
English: The Union Army needed a quick and easy way to encode flag and torch signals on Civil War battlefields. Colonel Albert J. Myer, Signal Officer of the Army, developed this cipher wheel. Four card stock disks allowed the user to encode letters with various flag signals (1 or 8 in various combinations). They were numbered to maintain control over these secret cryptographic devices. |
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| Source | https://www.archives.gov/press/press-kits/civil-war/gallery-page13.html |
| Author | Unknown author |
Licensing
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
 Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. |
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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | ||
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:19, 6 November 2024 | | 2,400 × 2,472 (1.19 MB) | Jordanroderick | Uploaded a work by {{Unknown|author}} from https://www.archives.gov/press/press-kits/civil-war/gallery-page13.html with UploadWizard |
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