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    Re: Troubleshooting Kollsman Periscopic Sextant
    From: Art Leung
    Date: 2022 May 11, 09:29 -0700

    Sorry to come to this conversation a little late.

    As previously mentioned, the distortion you see is from a damaged pellicle.  I have fixed these with clear plastic wrap and overhead transparancy film.  Both work fine - transparancies are easier to work with but the clear plastic wrap makes for a better image.

    If the bubble cannot be adjusted down by working the knob while tilting the chamber left, then you can try what I did here:
    Refilling a Kollsman Bubble Chamber – a guest post by Arthur Leung | The Nautical Sextant (sextantbook.com)

    -- Art

       
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