Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Hardware store Xylene in A-12 bubble sextant?
    From: Paul Dolkas
    Date: 2017 Oct 4, 19:21 -0700

    I’ve run my A-12 with Isopropanol (the pure stuff, not the 70% you find in drug stores).  Where I used to work they had gallons of the stuff for cleaning instruments and the like. Works just fine. Xylene is usually chosen for bubble chambers because it’s index of refraction closely matches that of the curved glass windows  (making it a solid “block” as far as the light is concerned).The A-12 optical path is such that it doesn’t matter much, so isopropanol works just as well.


    Paul Dolkas


    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Jim Speedwell
    Sent: Wednesday, October 04, 2017 1:49 PM
    To: paul@dolkas.net
    Subject: [NavList] Hardware store Xylene in A-12 bubble sextant?


    I just bought an A-12 sextant with a dry bubble chamber, which I need to refill.

    The manual calls for “chemically pure xylene”, I can find high purity xylene on Amazon, which seems to be good, but it’s expensive.

    I know Hardware store Xylene contains impurities, what would be the harm of these impurities in a bubble chamber besides possibly leaving a residue?

    And couldn’t you check for residue, by pouring the xyline into an open container and letting it to evaporate and then see if it left a film?


    View and reply to this message

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.

    Email Settings

    Posting Code:

    Custom Index

    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site