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    Re: Small zenith distance: a "bubble" sextant vs a Newtonian type sextant?
    From: Tony Oz
    Date: 2018 Feb 28, 02:18 -0800

    Frank, you asked if I tried to handle a bubble sextant - no, I do not have experience with any of them. I thought if I put the bubble into the very center of the bubble-chamber (as I saw on the pictures - often marked by special lines/circles) - I am guaranteed to make it perfectly vertical. Is that a wrong impression?

    My experience with a "marine" sextant proves it is tricky to have it precisely vertical - often there are no means (like a horizon prism etc) to check the instrument position.

    I see a piece of IMS-3 (a soviet-made integrating bubble-sextant) on sale (rather cheap) so I definitely will try to buy it.

    Regards,

    Tony

       
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