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    Re: Calibrating a sextant scale
    From: Alexandre Eremenko
    Date: 2007 Nov 24, 11:25 -0500

    Dear Richard,
    > one "WILD T2 T-2 THEODOLITE
    > Winning bid:  US $367.67
    Well, it happens. I am extremally unlucky with e-bay,
    If I do not bid, the things go cheaply:-)
    But whenever I bid, it seems that someone is willing
    to match whatever price I bid for:-(
    > Did you run into the Soviet
    > version of the mil, at 6000mils to the circle?
    Yes, during my brief service in the anti-aircraft artillery.
    All Soviet land-based
    artillery used this system of angle measurement.
    In the gun sights, radars, "The Device", compasses,
    range-finders etc.
    No degrees anywhere. It was simply called
    "one angular division" or
    "one thouthands" in literal translation from Russian.
    The rule was that you see an object of size 1 meter
    at 1 kilometer distance under the angle
    "one division"=1/6000 part of the circle.
    That is they assumed that pi=3 for mental calculations.
    ("The Device", of course performed calculations exactly).
    The airforce and navy used degrees, so there were
    communication problems when any interaction was required:-)
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