NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Introduction
From: Fred Hebard
Date: 2008 May 4, 09:23 -0400
From: Fred Hebard
Date: 2008 May 4, 09:23 -0400
George, I was using the term eccentricity of the arc to avoid discussing calibration certificates and calibration. I suppose I shouldn't have done that. To my knowledge, eccentricity of the arc is one of the reasons for a decrease in accuracy; I was using it as the sole reason. My comments were based solely on examining the calibration certificates in photographs on EBay. I've examined about 56 of those. Fred On May 4, 2008, at 6:18 AM, George Huxtable wrote: > > Fred wrote, about the Husun Mate- > > The later ones, from 1942 on, have quite a bit of > | eccentricity in the arc; they may have let quality slip to increase > | production for the war, not to mention the Blitz. > > and- > > | $300-500. Then there are old U.S. Navy sextants. These also have > | considerable eccentricity. They also are not as common as the first > | two and often are in need of serious repair when available. You > will > | see the ones needing serious repair go for prices lower than $300. > > ================ > > Tell us more about this eccentricity in the arc, Fred. > > How does it show up, and what is its effect? Does it give rise to > stiffness, > over part of the travel? Does it affect the calibration? > > George. > > contact George Huxtable at george@huxtable.u-net.com > or at +44 1865 820222 (from UK, 01865 820222) > or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. > > > > --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---