Very interesting! I've checked the math and Chevalier/USGS apparently
used the Mendenhall conversion factors. The map doesn't state a unit for
elevations or depths, that I could find. Likely those are in feet and in
fathoms/feet, respectively.
Jim
Carleton MacDonald wrote:
Neat map of San Francisco from 1915.
Expand the size, then check out the scale in the lower right corner.
1915!
Carleton
http://sf-nic.com/railroads/Chevalier-6000.jpg
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James R. Frysinger
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