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File:Four Hammer bulbs.jpg

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Summary

Description
English: Four filament electric light bulbs from the William J. Hammer Historical Collection of Incandescent Electric Lamps
Date
Source

Smithsonian Institution - William J. Hammer Collection

http://ids.si.edu/ids/deliveryService?id=NMAH-AC0069-0000001
Author William J. Hammer

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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:Four_Hammer_bulbs.jpg

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1 January 1904Gregorian

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Date/TimeThumbnailDimensionsUserComment
current18:48, 19 April 2016Thumbnail for version as of 18:48, 19 April 20161,999 × 1,137 (1.82 MB)Doug ColdwellUser created page with UploadWizard
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