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File:U.S. Signal Corps Heliograph on Mexican Border ca. 1916.jpeg

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English: U.S. Army Signal Corps troops at the U.S.-Mexican border ca. 1916 on a rocky outcrop, sending signals by heliograph. The heliograph is of the 1905 U.S. Signal Service type, set up in the duplex (dual-mirror) configuration. The heliograph has two tripods, one holding two square mirrors, the other a six-bladed shutter. Two binoculars are evident. The troops are wearing campaign hats and carrying canteens. Photograph by A.L. Fletcher of the (North Carolina) Raleigh News and Observer. The North Carolina National Guard was stationed here during General Pershing's Punitive Expedition vs. Pancho Villa. From Thomas C. Alston Papers, WWI 66, WWI Papers, Military Collection, State Archives of North Carolina, Raleigh, N.C. Courtesy of the State Archives of North Carolina
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Source https://www.flickr.com/photos/north-carolina-state-archives/32537741792/in/faves-53832127@N04/
Author State Archives of North Caroliina c/o: A.L. Fletcher

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current22:19, 5 February 2017Thumbnail for version as of 22:19, 5 February 20171,721 × 1,061 (164 KB)Macchess (talk | contribs){{Information |Description ={{en|1=U.S. Army Corps troops at the U.S.-Mexican border ca. 1916 on a rocky outcrop, sending signals by heliograph. The heliograph is of the 1905 U.S. Signal Service type, set up in the duplex (dual-mirror) configuration...

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