File:Sun Compass.jpg

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Terrible photo. Amazing example of innovation. This is a "sun compass" which was invented out of necessity. The wall plate reads:

William Burt and the Solar Compass Burt's solar compass enabled him to complete his survey of Upper Peninsula lands accurately and on time despite the presence of large deposits of iron ore.

The sensitivity of the magnetic compass to iron in the ground led William Austin Burt to devise the solar compass, which he patented in 1936. It soon became the preferred instrument for use in areas where the standard magnetic surveyor's compass was unreliable.
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Source originally posted to Flickr as Sun Compass
Author Ed Schipul
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This image, which was originally posted to Flickr, was uploaded to Commons using Flickr upload bot on 4 November 2010, 12:45 by Doug Coldwell. On that date, it was confirmed to be licensed under the terms of the license indicated.
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current12:45, 4 November 2010Thumbnail for version as of 12:45, 4 November 20102,560 × 1,706 (364 KB)Flickr upload bot (talk | contribs)Uploaded from http://flickr.com/photo/16638697@N00/683341276 using Flickr upload bot

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