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    Re: Instrument repair
    From: Paul Hirose
    Date: 2002 Dec 18, 20:32 -0800

    Ken Gebhart wrote:
    > lower lenses of the chamber.  This is predicated on the fluid in the chamber being
    > xylene, which it is in all aircraft sextants except the Kollsman periscopic
    > sextant which has a silicone fluid, as does the C. Plath marine bubble chambers.
    > We have not heard of a recommended size for these.
    Thanks for a highly informative message; I archived it on my computer.
    A copy of the Kollsman manual came with my sextant. It says,
    "Suggested size of bubble is about 1 1/2 to 2 degrees (the sun appears
    to subtend about one degree)."
    At first I thought the manual was wrong about the sun's size, but then
    I realized it must be including the sextant's 2x magnification.
    I don't know why the writer didn't simply say to make the bubble about
    1.5 to 2 times the diameter of the sun or full moon.

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