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
    Troubleshooting Kollsman Periscopic Sextant
    From: Joe Wong
    Date: 2022 May 10, 23:27 -0700

    Dear all,

          Just acquired this Kollsman Periscopic sextant from a layman seller on ebay. The seller was unable to perform a thorough inspection on the instrument,so as to check the overall functionality, instead he just stated that all knobs work and the clockwork ticks.

          Upon receiving the sextant and examining the sight I dicovered that the bubble is oversized and cannot be adjusted by the "Increase Bubble" knob. Plus there is a quite noticeable "wave-like" distortion located in the upper-left portion of the crosshair (see first attachment).

          I intend to restore the equipment back to serviceable conditions but a lack of knowledge and manual guidance prevent me from doing further disassembly in order to work out all the sources of the problems. Although I do suspect that the bubble problem was caused by spirit leak.

         I really hope someone here who has knowledge on the Kollsman periscopic sextant, or has real ones in their possession can help me in troubleshooting and fixing the sextant. Much appreciated!!



    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