telescopes
15 photos and 1 illustration tagged telescopes, from 10 members of Flickr Commons.
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18% of these photos & illustrations are geotagged.
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Tags that often appear on the same photos & illustrations:
- observationtowers
- miamidigitalcollections
- women
- war
- propaganda
- wwi
- great
- photojournalism
- worldwari
- worldwarone
- ww1
- greatwar
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- thegreatwar
- 19141918
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- nls:dodprojectid=74462370
- organization:library=nationallibraryofscotland
- owner:name=nationallibraryofscotland
- nls:source=solrxml
- blackandwhiteprintsphotographs
- worldwar19141918campaignswesternfront
- telescope
Members using this tag
- Miami University Libraries - Digital Collections
- National Library of Scotland
- Cornell University Library
- George Eastman Museum
- Royal Australian Historical Society
- Llyfrgell Genedlaethol Cymru / The National Library of Wales
- Center for Jewish History, NYC
- State Library of Queensland
- Florida Memory
- British Library
Photos & Illustrations
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Photos & Illustrations tagged telescopes:
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Recent uploads
The last upload was May 2015.
Evans Crown, Bathurst Road from Royal Australian Historical Society uploaded May 2015
Burrell Memorial Observatory, Baldwin- Wallace College, Berea, Ohio from Miami University Libraries - Digital Collections uploaded February 2014
Burrell Memorial Observatory, Baldwin- Wallace College, Berea, Ohio from Miami University Libraries - Digital Collections uploaded February 2014
British Library digitised image from page 496 of "A Tramp Abroad. By Mark Twain" from British Library uploaded December 2013
On the verandah at Emu Park from State Library of Queensland uploaded May 2013
New Year greeting card from Center for Jewish History, NYC uploaded September 2012
Visual signaling, this being possible as we advance from National Library of Scotland uploaded June 2010
Spotting a German plane from National Library of Scotland uploaded June 2010
King watching the Battle of Pozieres from captured German trenches from National Library of Scotland uploaded June 2010
"The Pirates" Under False Colors - Can They Capture the Ship of State? from Cornell University Library uploaded February 2010
Mix and Match Portrait Cards, 1881 from Cornell University Library uploaded February 2010
Caswell Bay from Llyfrgell Genedlaethol Cymru / The National Library of Wales uploaded October 2009
Army signal corps soldiers during the Spanish-American war from Florida Memory uploaded April 2009
Conversations
Here’s a selection of the conversations happening on these photos & illustrations:
Army signal corps soldiers during the Spanish-American war
from Florida Memory
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signal mirror said:
Heliograph: The two tripods held by the two soldiers at right comprise a US Army Signal Corps heliograph - a tripod-mounted device for sending messages by flashes of sunlight using Morse or Myer code, with a range up 30 miles or so. This heliograph is set up in duplex, or "dual-mirror" mode, the mode used when the sun was behind the signalers. The job of the dark-suited soldier at the extreme right was to keep the sun beam reflected by the dual 4.5 inch square mirrors on his tripod in constant alignment on the target as the sun moved, using vernier elevation and azimuth screws. The job of the light-suited soldier in the middle was to open and close the shutter flap on his tripod to produce the dots and dashes of the code. A diagram showing this heliograph (albeit in single-mirror mode), taken from [1], is here (click on the thumbnail to magnify), and see [1] for the dual-mirror mode diagram.
An 1893 photograph of this type of heliograph (albeit in single-mirror mode), taken from [2], is here (click on the thumbnail to magnify)
To learn more about heliographs, you can read [1] and [2], as well as this Wikipedia article:
en.wikipedia.org/wiki/Heliograph
You can also see this Flickr gallery (click on the thumbnail):
[http://www.flickr.com/photos/signalmirror/galleries/72157630246445306/]
and this set (click on the thumbnail) : (Historical Photographs of American Heliographs)
[http://www.flickr.com/photos/signalmirror/sets/72157631040759962/]
[ 1 ] Annual Report of the Chief Signal Officer of the Army to the
Secretary of War for the Year 1888, Government Printing Office, 1889
The new standard heliograph is discussed in Appendix I, pp. 42-47,
and depicted on page 46, here:
books.google.com/books?id=E2nPAAAAMAAJ&pg=PA46&dq...
[2] "The Heliograph", The Compass, Vol. II, No. 11, June 1, 1893, page 161
books.google.com/books?id=tX0SAAAAYAAJ&pg=PA161 -
Florida Memory said:
signal mirror Thanks for the great information!
Visual signaling, this being possible as we advance
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signal mirror said:
The "mirror and disc" apparatus at the right is a 5" Mance heliograph. The heliograph was used to signal by Morse code using flashes of reflected sunlight created by tilting the mirror intermittently. This one is set up in the "duplex" (twin mirror) arrangement. The duplex configuration was used when the sun was on the opposite side of the signaller from the target. The leather carrying case dangling below the tripod by the shoulder strap was use to carry the parts atop the tripod for travel, and the tripod itself was slung over the shoulder by the strap attached to the left leg of the tripod, with the cylindrical cap at the end of the sling holding the legs of the tripod together. The disc dangling just above the case is a protective cap (with female threads) that protected the male threads atop the tripod. As noted at left, the heliograph saw little use during the trench warfare on the Western front in WWI, but rather more so in the mobile warfare towards the end. Another photograph of heliographs in use on the western front is this one at the Imperial War Museum: www.iwm.org.uk/collections/item/object/205072698 .For more information on heliographs, see the Wikipedia article on heliographs and its references.
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DesertBlooms said:
British troops operating from Nordia Hotel building overlooking Jaffa Road and Barclays Bank, showing heliograph operator signaling to troops on Tower of David, Jerusalem, Palestine - circa 1938

New Year greeting card
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jadensmith122@rocketmail.com said:
cool
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jadensmith122@rocketmail.com said:
lol