NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: C. Plath optical instrument
From: Sean C
Date: 2018 Jun 7, 21:56 -0700
From: Sean C
Date: 2018 Jun 7, 21:56 -0700
My first thought was that some of the parts resemble my U.S. Army lensatic compass, which is used for taking magnetic bearings to objects. After some searching, I found a few listings for a "U.S. Navy Bearing Bar" (whatever that is) which looks somewhat similar in design. So, My guess is that it is some device which fits on/over a ship's compass to aid in taking bearings.
https://www.ebay.com/itm/252644923434?rmvSB=true
https://www.aspireauctions.com/#!/catalog/316/1401/lot/50227
-Sean C.
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