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
    A-10 Bubble Sextant Assembly
    From: UNK
    Date: 2021 Jan 23, 12:25 -0800

    I ended up having to disassemble an old A-10 and I’m trying to get it back together correctly. 

    I’ve gotten the gear attached to the movable prism fairly close - 25 low reading, 33 low, 34 low, 28 low, 25 low. 

    I finally reached this point by moving the prism and gear and reengaging the gear without really being able to tell where I was. Really fine teeth for old eyes. 
    It looks like I need to adjust another 30 minutes but I don’t know if that’s possible using the gear and worm. 

    Has anyone ever figured out how much one tooth changes things? If it’s 30 minutes, I can eventually get there. If it’s 60 minutes, that’s not the solution. 

    The readout isn’t the solution. One turn there is 60 minutes.

    Regards, Noell


    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