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    Re: My Kollsman sextant.
    From: Paul Hirose
    Date: 2021 Jun 19, 13:56 -0700

    On 2021-06-19 10:00, David Pike wrote:
    > Have
    > you worked out how to make a bubble yet? That can be fun.
    
    I have the sextant instructions from US Air Force Manual 51-40 online.
    It does NOT include the electronic averager.
    
    http://sofajpl.com/airnav/index.html#PERISCOPIC
    
    They describe how to form the bubble. Also see the section on
    collimation (the correct sight picture) near the end of the page. This
    is common to all bubble sextants.
    
    The periscopic sextant is quite usable when hand held. Though much
    heavier than a marine sextant, its shape and the location of the
    altitude knob are such that you can hold the sextant with both hands
    while your elbows are braced against your chest. A 2-minute observation
    with the averager is feasible, though the coordination and sustained
    concentration to maintain collimation is quite something — very
    different from a marine sextant. But that just adds to the fun.
    
    --
    Paul Hirose
    http://sofajpl.com/
    

       
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