Image:Heliograph.jpg

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Description
English: heliograph - Signaling with heliograph near Monument 92. Alaska - Canada border. International Boundary Commission
Source

NOAA's Historic C&GS (Coast and Geodetic Survey) Collection. Image ID: theb1632
Date

1910
Author

US National Oceanic and Atmospheric Administration
Permission
(Reusing this image)
Public domain This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright.

Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision.

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File history

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Date/TimeDimensionsUserComment
current09:15, 3 April 20051,376×900 (538 KB)Svdmolen (heliograph -http://www.photolib.noaa.gov/historic/c&gs/theb1633.htm {{PD}} category:science)
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