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    Re: Using star-star distances
    From: Hewitt Schlereth
    Date: 2008 Sep 23, 22:05 -0400

    I'm trying to restore an Ebbco sextant. What I need is a set of shades
    and the spring retainer for the horizon mirror or an entire horizon
    mirror assembly. The model I have is the later one with the larger
    mirrors and three index-mirror shades.
    Ebbco doesn't have a web site and the letter I wrote them came back
    with a laconic note "moved." (Be nice if it had said where).
    FWIW : I used an Ebbco for years and it always stayed true to the DR
    and always got me there.
    On 9/23/08, Bill  wrote:
    >  George wrote
    >  > That's interesting, and rather a surprise to find such extreme
    >  > bad-behaviour. Was the index error similarly unstable, or did the index
    >  > error stay put while the calibration changed? What were the conditions of
    >  > the test? Had the instrument been given any time to stabilise, in
    >  > temperature? Presumably, the instrument had been checked-over to ensure that
    >  > no mirrors or brackets were at all wobbly
    > If you have not checked out David Burch's field tests of plastic sextants,
    >  Frank's figures might seem a bit high, but they are pretty much in line with
    >  Burch's findings.
    >  Bill B.
    >  >
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