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| View Original: | Heliographing_from_Pehtud_to_Marahui_1898.jpg (2045x1593) | |||
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| Keywords: heliograph heliographe heliógrafo signaller signallers spanish american war spanishamericanwar signal service signalservice us signal service ussignalservice phillipines mindanao 1898 blackandwhite monochrome outdoor black and white This photo is of US Army Signal Service personnel, taken in 1898 on Mindanao Island on the Phillipines. They are operating a US Signal Service heliograph, a device to transmit messages by Morse or Myer code by reflecting sunlight at the target using the 4.5 inch square mirrors on the rear tripod, and modulating it with the the dual-bladed shutter on the right hand tripod. The dual-bladed shutter was invented in 1892 by Captain C.E. Kilbourne, U.S. Signal Corps, and replaced the single leaf "drawbridge style" shutter of 1888. This is a reprocessed crop from the original photograph held at the University of Michigan Special Collections. I obtained it from Wikimedia Commons (which has a hyperlink to the University of Michigan record) here: commons.wikimedia.org/wiki/File:Heliographing_from_Pehtud... I cropped it, converted it to black and white, and contrast enhanced it. If the law considers my actions to have given my copyright to this modified photo, I hereby release that copyright to the public domain, as indicated by the Flickr CC0 copyright license. I make no claim of copyright on this, you can do with it what your laws allow. As a pre-1923 photo, it should be in the public domain in the United States. You can, of course, obtain the full version from Wikimedia or the University of Michigan, as I did. If you wish to start with my version, you may want the high-resolution version here: www.flickr.com/photos/signalmirror/8324614725/sizes/o/ This photo is of US Army Signal Service personnel, taken in 1898 on Mindanao Island on the Phillipines. They are operating a US Signal Service heliograph, a device to transmit messages by Morse or Myer code by reflecting sunlight at the target using the 4.5 inch square mirrors on the rear tripod, and modulating it with the the dual-bladed shutter on the right hand tripod. The dual-bladed shutter was invented in 1892 by Captain C.E. Kilbourne, U.S. Signal Corps, and replaced the single leaf "drawbridge style" shutter of 1888. This is a reprocessed crop from the original photograph held at the University of Michigan Special Collections. I obtained it from Wikimedia Commons (which has a hyperlink to the University of Michigan record) here: commons.wikimedia.org/wiki/File:Heliographing_from_Pehtud... I cropped it, converted it to black and white, and contrast enhanced it. If the law considers my actions to have given my copyright to this modified photo, I hereby release that copyright to the public domain, as indicated by the Flickr CC0 copyright license. I make no claim of copyright on this, you can do with it what your laws allow. As a pre-1923 photo, it should be in the public domain in the United States. You can, of course, obtain the full version from Wikimedia or the University of Michigan, as I did. If you wish to start with my version, you may want the high-resolution version here: www.flickr.com/photos/signalmirror/8324614725/sizes/o/ | ||||
