NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Paul Dolkas
Date: 2013 Mar 5, 20:27 -0800
Paul-
Are you sure? I always imagined that they filled the plastic on the 25 with glass fibers to make it stiffer and less subject to temperature distortion (just conjecture – I have never so much as laid eyes on a 25). Anyway, that is what I would do if I were designing a range of plastic instruments. It takes a bit of a seasoned eye to differentiate between filled and unfilled polymers. Is there some way of finding out for sure what the difference in plastic is?
-Paul
Paul Dolkas
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Paul Fithian
Sent: Monday, March 04, 2013 11:35 AM
To: paul@dolkas.net
Subject: [NavList 22620] Re: Davis and Astra head to head
There is no difference in the plastic used for the Mark 15 and Mark 25 sextants except for color.
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