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Summary

Description
English: Amateur radio operator w:Charles E. Apgar with his wax cylinder invention for recording w:wireless telegraphy transmissions.
Date
Source Reproduced in "The Secret Service of the Air". Popular Radio. New York: July 1922, page 167.
Author Samuel Cohen

Licensing

Public domain
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.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Charles_Apgar.png

Captions

Charles E. Apgar with his wax cylinder invention for recording wireless transmission.

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a235f6763ddedec12268de6398881de156b5cf13

876,860 byte

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1,122 pixel

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current20:45, 22 December 2019Thumbnail for version as of 20:45, 22 December 20191,122 × 1,139 (856 KB)Mu301User created page with UploadWizard

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