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    Re: Freiberger pressie
    From: Gerard Mittelstaedt
    Date: 2002 Nov 20, 08:29 -0600

     I am sure that one good reason for skeletonized frames is to
    reduce wind resistance.  Holding something up steady in a 15 to 20
    breeze is more difficult if it catches more wind.
     This was a major issue very early in Renaisance navigation when
    disk astrolabes gave way to the marine astrolabe.
    - GM
    George Huxtable wrote:
    > A few years ago I read a letter in the Journal of Navigation from a
    > merchant sea-captain of many years experience, who explained that he
    > cherished his old sextant because of its very weight, which he explained
    > gave it stability when used on the bridge in windy weather. One has to
    > respect the voice of experience.
    > On the other hand, if weight was such an advantage, why do sextant makers
    > go to such trouble to use lightweight materials, and skeletonize the frames
    > to leave the minimum of material behind?
    > And if weight was such an advantage, it would be an easy job to "improve"
    > an over-lightweight sextant by clamping on lead ballast to the frame, in
    > appropriate places. I have never heard of such an "improvement" being made,
    > even by the crustiest old salt. Has anyone else?
    > My conclusion? That in reality, other things like rigidity being equal, the
    > lighter a sextant is, the better it will be. Just my opinion, for what it's
    > worth.
    > George Huxtable.
    > ------------------------------
    > george---.u-net.com
    > George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    > Tel. 01865 820222 or (int.) +44 1865 820222.
    > ------------------------------
    Gerard Mittelstaedt    mitt{at}hiline.net
    McAllen, Texas

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