The first Odessey Protractor.
This instrument was used to plot intersecting ranges from two RAR stations.
Invented while Herman Odessey attached to DISCOVERER.
Variations of this instrument were used for plotting positions for over 60 years
Image ID: theb2252, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1929
Credit: C&GS Season's Report Odessey 1929-60
Category: Charting/Navigation/Electronic/Radio-Acoustic Ranging/
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
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April 30, 2013