File:Oldest Headphones Siemans 1893.png

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Oldest_Headphones_Siemans_1893.png (189 × 355 pixels, file size: 10 KB, MIME type: image/png)

Captions

Captions

Oldest example of headphones; headset made by Siemens Brothers 1893

Summary

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Description
English: Oldest example of headphones; headset made by Siemens Brothers 1893. Description of figure: "Two receivers are sometimes used in this case and fig 28 illustrates two receivers in connection with a very comfortable form of head gear made by Messrs Siemens Bros. It will be seen that the instrument is fixed by means of a head strap and that the position of the receivers is adjustable.
Date
Source https://books.google.com/books?id=WZ1RAAAAMAAJ&pg=PA56
Author William Henry Preece, Arthur James Stubbs

Licensing

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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:Oldest_Headphones_Siemans_1893.png

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current23:49, 5 May 2023Thumbnail for version as of 23:49, 5 May 2023189 × 355 (10 KB)Guest2625 (talk | contribs)Uploaded a work by William Henry Preece, Arthur James Stubbs from https://books.google.com/books?id=WZ1RAAAAMAAJ&pg=PA56 with UploadWizard

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