Welcome to the NavList Message Boards.

NavList:

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

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Fluids for Bubble Sextants and Sealing Methods
    From: Robert Swartz
    Date: 2015 Dec 28, 15:08 -0800

    Herman;

    There is nothing in the Link literature on the mounting order of the sun shades,

    Both bubble chambers should have Bristol set screw filler plugs with either small ball bearings inserted or, in the case of early A-12s, points on the end of the filler plugs.

    Refilling bubble chambers was part of routine maintenance of bubble sextants--The integrity of the filling depends on the seals and the tightness of the filler plugs (which I also seal w/liquid shellac) after filling the chambers w/ xylene.

    Your sextant is severly out of calibration and probably needs an overhaul. I calibrate the sextants I sell to 1-2 minutes of arc using a Link Collimator. You can use the natural horizin at the shore of a large lake or the sea under calm conditions as a zero datum. You can also use Polaris from a known latitude (requires correction tables in the Nautical Almanac).

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    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