NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sextants, vernier and micrometer.
From: George Huxtable
Date: 2006 Nov 1, 22:48 -0000
From: George Huxtable
Date: 2006 Nov 1, 22:48 -0000
Alex wrote, on 31 Oct, about a prospective sextant, | The seller says that there is no adjusting tool. | It seems to me that on this type of a sextant, one | does not need any tool to adjust the mirrors: | the screws can be rortated with fingers, am I right? I think rotation with the fingers would be too crude. The adjusting screw will probably have a pair of cross-holes in the cap into which a pin can be inserted as a tommy-bar for very careful adjustment. Usually, an object that looks rather like a hatpin, but with a fancy brass knob, is supplied, and this has a slight taper so that it gives a good fit without wobbles. The brass knob is no more than decoration. A suitably chosen twist-drill ought to do the job. 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. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
