NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
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 --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---