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    Re: micrometer sextants.
    From: Wolfgang K�berer
    Date: 2009 Jul 17, 21:20 +0200

    May I feed one of George's favourite hobby-horses?
    I just bought a copy of the Admiralty Manual of Navigation, Vol. 1, 1928
    Edition but reprinted 1933. In the back of the front cover is the Husun ad
    which I am attaching. It shows a "Gothic Sextant with Detachable Bubble
    Horizon". God (or probably Willem M�rzer Bruijns) knows what a "Gothic
    Sextant" is, but it is also a micrometer drum sextant. The point interesting
    here is that the ad refers to the Husun Patent Micrometer Tangent "reading
    to 10 secs." This must be referring to the GB patent no. 309,648
    ("Improvements in Micrometer Tangents Screw Gear") applied for by - among
    others - Henry Hughes & Son on January 24, 1928. There is no claim for
    accuracy in the patent description, though.
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