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    Re: Question about Davis Mk 25 sextant beam converger
    From: Fred Hebard
    Date: 2006 May 8, 13:26 -0400

    One needs to check IE each time the sextant is used.  But one doesn't
    need to ADJUST IE to zero each time.
    On May 8, 2006, at 10:45 AM, Red wrote:
    > Greg-
    >  Even with a better sextant, it is "proper" practice to check for
    > IE every time you use the sextant. I've seen IE hold at zero for a
    > zero, even with changing temperatures, but all it takes is one
    > bump, one slip, and then your sights are down the drain. Far more
    > "professional" to check it every time so you know it hasn't
    > changed, instead of assuming so.
    >  The plastic sextants are supposed to be less stable with
    > temperature change, so that taking one from a warm indoor home out
    > into cold air, or taking one and leaving it in hot sunlight, etc.,
    > all can cause thermal changes in the frame, which bring changes in
    > the IE.

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