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: Troubleshooting Kollsman Periscopic Sextant
    From: David Pike
    Date: 2022 May 11, 07:44 -0700


    Remember ‘Primum non nocere’.  See if you and get your Kollsman to work as is before trying anything else.  Then you know where you’re starting from.  To play with the bubble you need to know that it lives down a little hole in the 3 O’ Clock position at the outer edge of the view through the eyepiece.  It’s alongside the righthand edge of the fine black horizontal hairline you can see in your photograph. You can adjust the size of the bubble by turning the top right-hand knob which says “Increase Bubble”. Proceed as follows:

    1.       Sit the sextant on a widow ledge or similar looking outdoors.

    2.       Look through the eyepiece and find the black horizontal hairline.

    3.       Tilt the sextant up to 45 degrees left until the bubble lies against the right-hand edge of the black horizontal hairline.

    4.       Move the bubble adjusting knob to alter the size of the bubble.  If the bubble hasn’t been adjusted for a while, you might need to move the knob backwards and forwards a couple of times and maybe give a slight cough to wake it up.  I find it also helps if you whisper encouragement by telling it what a beautiful bubble it is, but you would appreciate it if it were just a little bit smaller or larger.  DaveP

    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