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Blogger Silver Fox said...

Great views of the glacier and rock glacier -- in this post and in the July post, which I somehow missed until today (work, perchance?).

August 18, 2013 at 2:25 PM

Blogger Flashes of Sunlight said...

Great photos! One quibble - if you asked the folks who built those round rock shelters, they'd have said they were using "heliotropes", not "heliographs".

Surveyors were using heliotropes long before heliographs were invented, and long after heliographs fell into disuse, though GPS surveying finally pretty much put an end to the practice in the late 1980s.

A great book on this survey is "Geodesy: the transcontinental triangulation and the American arc of the parallel", 1900, US Coast and Geodetic Survey. You can read it on Google Books: books.google.com/books?id=--MNAQAAMAAJ

If you search inside that book for heliotrope, you'll find 8 references - for heliograph, none. Plate 41 (preceding page 553) shows a heliotrope set up outside one of the rock rings. Plate 37 is a closeup of three heliotropes. For more about heliotropes, see: http://en.wikipedia.org/wiki/Heliotrope_%28instrument%29

January 12, 2015 at 12:35 AM

Blogger Desert Survivor said...

Thanks, Flashes of Light. Good to know more of the story!

January 12, 2015 at 6:22 AM

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