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File:Heliograph.jpg

Original file (1,376 × 900 pixels, file size: 538 KB, MIME type: image/jpeg)

Description
English: heliograph - Signaling with heliograph near Monument 92. Alaska - Canada border. International Boundary Commission
Date
Source NOAA's Historic C&GS (Coast and Geodetic Survey) Collection. Image ID: theb1633
Author US National Oceanic and Atmospheric Administration
Permission
(Reusing this file)
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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Date/TimeThumbnailDimensionsUserComment
current09:15, 3 April 2005Thumbnail for version as of 09:15, 3 April 20051,376 × 900 (538 KB)Svdmolenheliograph -http://www.photolib.noaa.gov/historic/c&gs/theb1633.htm {{PD}} category:science
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