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Summary
DescriptionCharles Apgar.png
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 domainPublic domainfalsefalse
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.
Items portrayed in this file
depicts
Charles E. Apgar
copyright status
public domain
inception
1915
media type
image/png
checksum
a235f6763ddedec12268de6398881de156b5cf13
determination method: SHA-1
data size
876,860 byte
height
1,139 pixel
width
1,122 pixel
File history
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Date/Time
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Comment
current
20:45, 22 December 2019
1,122 × 1,139 (856 KB)
Mu301
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