File:Ernst Ruhmer, Technical World cover (1905).jpg

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Ernst_Ruhmer,_Technical_World_cover_(1905).jpg ‎(332 × 503 pixels, file size: 131 KB, MIME type: image/jpeg)

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Summary

Description
English: Drawing of Ernst Ruhmer listening at one station to his "photo-electric" optical wireless telephone system.
Date
Source Cover page, Technical World magazine, March 1905
Author Magazine cover

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, 1930.
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.

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inception

1 March 1905Gregorian

data size

134,172 byte

height

503 pixel

width

332 pixel

media type

image/jpeg

checksum

5a7bc5766adaf7f99f114f741c7b2f25ce0dee34

determination method: SHA-1

File history

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Date/TimeThumbnailDimensionsUserComment
current04:01, 30 January 2018Thumbnail for version as of 04:01, 30 January 2018332 × 503 (131 KB)wikimediacommons>Thomas H. WhiteUser created page with UploadWizard

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