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    Re: Hardware store Xylene in A-12 bubble sextant?
    From: Robert Eno
    Date: 2017 Oct 4, 21:54 -0600

    Try hexane. This is what I have used to re-fill my C.Plath bubble attachment and it is also what was used in the RAE MK IXA

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Paul Dolkas
    Sent: October-04-17 8:44 PM
    To: enoid{at}northwestel.net
    Subject: [NavList] Re: Hardware store Xylene in A-12 bubble sextant?

     

    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{at}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?

    Thanks.

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