File:Heliograph-2.jpg

Description
English: heliograph - Signaling with heliograph near Monument 92. Alaska - Canada border. International Boundary Commission
Date (UTC)
Source
Author
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Cropped. The original can be viewed here: Heliograph.jpg: . Modifications made by Macchess.

Category:Retouched pictures#Heliograph-2.jpg
Public domain
This image is in the public domain because it contains materials that originally came from the U.S. National Oceanic and Atmospheric Administration, taken or made as part of an employee's official duties.

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Category:PD US NOAA#Heliograph-2.jpg

Original upload log

This image is a derivative work of the following images:

  • Image:Heliograph.jpg licensed with PD-USGov
    • 2005-04-03T09:15:47Z Svdmolen 1376x900 (551067 Bytes) heliograph -http://www.photolib.noaa.gov/historic/c&gs/theb1633.htm {{PD}} [[category:science]]

Uploaded with derivativeFX Category:Uploaded with derivativeFX

Category:History of engineering Category:History of telecommunications Category:Heliographs Category:1910 in Alaska
Category:1910 in Alaska Category:Heliographs Category:History of engineering Category:History of telecommunications Category:PD US NOAA Category:Retouched pictures Category:Uploaded with derivativeFX