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Summary
| Description |
English: Mining foreman R. Thornburg shows a small cage with a canary used for testing carbon monoxide gas in 1928. |
| Date | |
| Source | https://www.smithsonianmag.com/smart-news/story-real-canary-coal-mine-180961570/ |
| Author | George McCaa, U.S. Bureau of Mines |
Licensing
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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 | 06:00, 2 May 2022 | | 1,000 × 750 (72 KB) | Raresvent | Uploaded a work by George McCaa, U.S. Bureau of Mines from https://www.smithsonianmag.com/smart-news/story-real-canary-coal-mine-180961570/ with UploadWizard |
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