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    Re: The lost expedition of La Perouse
    From: George Huxtable
    Date: 2005 Jun 8, 19:29 +0100

    Marc Bernstein wrote-
    >I didn't realize sextants had been around so long. Of course we are not
    >talking about sextants as we know them today.
    Reply from George.
    Well, not so very different, Marc.
    What you would notice first is that there was no micrometer drum. Just a
    fine-ajustment screw, but then you had to read the angle directly off the
    engraved arc, with the help of a Vernier scale and a magnifying lens.
    You would find a longer telescope with smaller mirrors and a more
    restricted field of view. Somewhat heavier, being larger than a modern
    instrument, and made of brass, not aluminium.
    But otherwise, you could pick up an eighteenth-century sextant, and hardly
    notice the difference between that and your own.
    For further information, I recommend "Taking the Stars", by listmember
    Peter Ifland, beautifully illustrated.
    contact George Huxtable by email at george@huxtable.u-net.com, by phone at
    01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy
    Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.

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