File:Charles Apgar audion circuit.png
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Summary
| Description |
English: Circuit diagram of amateur wireless station of Charles E. Apgar |
| Date | |
| Source | Apgar, Charles E. (September 1915). "Making the Records from Sayville: A Description of My Set and How I worked It". The Wireless Age. Vol. 2 no. 11. New York: Marconi Publishing Corporation. p. 879. |
| Author | Charles E. Apgar |
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. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:46, 26 December 2019 | | 517 × 468 (106 KB) | Mu301 | better quality, different version of same |
| 15:32, 23 December 2019 |  | 501 × 521 (163 KB) | Mu301 | User created page with UploadWizard |
File usage
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