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    Re: Construction of Sextant Arm Pivot Questions ?
    From: Philip Lange
    Date: 2007 Nov 08, 18:21 -0500

    My Plath has a bronze tapered pivot.  The pivot screw can be adjusted to
    compensate for wear. When this is done properly there is no wobble and the
    pivot arm swings freely.
    At 08:06 AM 11/8/2007, you wrote:
    >I guess I should introduce myself, somewhat.
    >Am a retired research engineer, and have always been interested in
    >navigation, but, unfortunately, more on the theoretical than the
    >actual "doing" side.
    >However, I did complete the two celestial navigation courses given
    >many, many, years ago by the U.S. Power Squadron, which included the
    >taking of many sextant sites.  Can't remember when i enjoyed any
    >courses more.
    >I don't really have the opportunity to inspect any sextants now
    >firsthand, but am quite interested in how these folks did, and
    >presently are, designing and fabrication the pivots for the arms.
    >Are they just a bored, and subsequently honed, hole for a steel pin ?
    >Is it a cylindrical hole, or tapered ?
    >Is there any "preload" to minimize wobble or looseness with wear ?
    >Different mfg's doing it differently ? In the past ?
    >Any good detailed pix available ?
    >Great Group; have learned much.
    >Bob   (Sudbury, Mass., USA)
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