Engraving depicting a portable reading lamp for
Engraving depicting a portable reading lamp for railway and other travellers. An incandescent bulb was placed in front of a highly polished parabolic reflector and was powered by four accumulator cells contained in a wooden box
Picture No
13914155
Media ID
48461176
Size
4360px x 4810px
(6.6MB)
Credit
World History Archive / Mary Evans Picture Library
Source
World History Archive
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Accumulator Bulb Cells Contained Highly Incandescent Parabolic Placed Polished Portable Reflector Travellers
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