NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Paul Dolkas
Date: 2013 Aug 3, 21:26 -0700
So THAT’S why they use Xylene… always wondered. It also makes sense that once you start to use it for one type, it tends to get used for all.
Paul Dolkas
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Bill Morris
Sent: Wednesday, July 31, 2013 1:46 PM
To: paul@dolkas.net
Subject: [NavList] Re: A-10 Sextant Maintenance Manual
Alcohol will not do for most A10 bubble sextants, which are fitted with vapour pressure bubble chambers, but will work with the A10-A, which have air chambers.
Xylene will have to be used in those few bubble sextants in which the light path of the heavenly body passes directly through the bubble chamber, since the refractive index of xylene is close to that of glass.
Bill Morris
Pukenui
New Zealand
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