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