Home / General Magazines / Science and Technology Magazines / Scientific American /
Scientific American 1912-10-26
795/1099
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
- Created on
- Thursday 26 January 2012
- Posted on
- Thursday 26 January 2012
- Tags
- communication, flash, optics, solar
- Visits
- 949