NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Lunar distance accuracy
From: Michael Daly
Date: 2007 Oct 25, 14:02 -0400
From: Michael Daly
Date: 2007 Oct 25, 14:02 -0400
Wolfgang K�berer wrote: > > And there is a "pillar sextant" on a pillar in another local museum, the > Science museum in London, UK. Have a look at their web site: > > http://www.sciencemuseum.org.uk/objects/astronomy/1931-95.aspx Ah yes - a double frame (pillar) sextant on a stand (pillar) - that ought to clear things up! :-) I have a scientific antique dealer's catalogue here with a surveyor's sextant described as a pillar sextant, so the term is clearly ambiguous. Troughton's patent was issued in 1788. If this is online or readily accessible to someone in Britain at a patent records office, it would be interesting to find out what name he used for it. I always took the "official" name to be double-frame and pillar to be the colloquial, but can't find anything in my books to support that notion. Mike --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
