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Scientific American 1912-10-26
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S - small
(304 x 432)
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(418 x 594)
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(532 x 756)
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(646 x 918)
Original
(650 x 923)
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Created on
Thursday 26 January 2012
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General Magazines
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Scientific American
A triple mirror for secret signaling. Signaling with one hand and watching the returning ray through the attached Zeiss prism monocular.
Source: Steve Kirch, collector, and creator of a great
website about SCIENTIFIC AMERICAN
in the past
Restoration by: magscanner
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