Sextometer invented by Carl Aslakson.
Known distance between sighting points.
Sextant angle varies with distance
Image ID: theb1735, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1930?
Credit: C&GS Season's Report Aslakson 1930-143
Category: Topography/Plane Table/
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
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June 10, 2016