NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Instrument for solving spherical triangles
From: Alexandre Eremenko
Date: 2012 Apr 25, 16:35 -0400
From: Alexandre Eremenko
Date: 2012 Apr 25, 16:35 -0400
Yes, Looks nice:-) Unfortunately I cannot afford one like that:-( Another such similar instrument was discussed on this list few years ago; it was sold on e-bay. I think I have a detailed description/manual of that one. Apparently such instruments were really used on the early stage of airplane navigation. I have the book of Hughes, "The book of sextant" which describes another one, called "Hagner position finder". In principle, they are analogous to astrocompasses and star globes, but have higher accuracy. I suppose something like 1'-2'. And probably work faster than "Complete on Board..." sight reduction tables. But unlike the tables, or electronic calculators, or even Bygrave slide rule, this is a really beautiful thing:-) Like any other analog computer. A museum piece. Alex. On Wed, 25 Apr 2012, G Becker wrote: > > Interesting instrument sold at Christies. > > http://www.christies.com/lotfinder/lot/an-instrument-for-solving-spherical-triangles-casella-5548772-details.aspx?from=searchresults&intObjectID=5548772&sid=541ab9de-ab20-4070-a282-96a70ce878b5 > ---------------------------------------------------------------- > NavList message boards and member settings: www.fer3.com/NavList > Members may optionally receive posts by email. > To cancel email delivery, send a message to NoMail[at]fer3.com > ---------------------------------------------------------------- > >File:> > > > > > : http://fer3.com/arc/m2.aspx?i=119254 > > >
