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    Re: Kollsman periscopic bubble sextant
    From: Dick Olds
    Date: 2017 Jul 25, 19:24 -0700

    Has anyone rebuilt a Kollsman periscopic sextant bubble chamber? One of mine is not functioning properly, as I cannot reduce the bubble to a usable size.

    I have exactly the same problem.  I recall 50+ years ago that I could tilt the sextant so that the bubble lodged in a "notch" on the periphery of the window, and then rotate the bubble adjustment to suck some gas out of the bubble.  But the Kollsman I bought a few years ago doesn't seem to have that notch.

       
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