Image: Edison incandescent lights
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Description: Photo of early paper filament incandescent electric light bulbs invented by Thomas Alva Edison in 1879. The caption read: 'Edison's famous horseshoe paper-filament lamp of 1870. Copyright 1904 by William J. Hammer.' Alterations: cropped out caption and frame, increased brightness slightly.
Title: Edison incandescent lights
Credit: Downloaded from Elmer Ellsworth Burns (1910) The Story of Great Inventions, Harper & Brothers, New York, p.123, fig.59 on Google Books.
Author: William J. Hammer
Permission: Public domain - published in USA before 1923
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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