US Army Signal station combining a heliograph with
US Army Signal station combining a heliograph with a telephone, 1908-1919. The heliograph wirelessly signaled Morse code with flashes of sunlight reflected in a mirror and timed by a hand operated shutter (BSLOC_2017_1_20)
Picture No
11970543
Media ID
45358018
Size
3000px x 2312px
(641KB)
Credit
Mary Evans / Everett Collection
Source
Everett Collection
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40 50 Years Old 40-50 Years Old Armed Forces Elevation Heliograph Hilltop Instantaneous Lcgr1702 Mirrors Occupational Portrait One Person Optical Shutter Tripod
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