NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Don't do this to a sextant
From: Alexandre Eremenko
Date: 2006 Nov 8, 00:57 -0500
From: Alexandre Eremenko
Date: 2006 Nov 8, 00:57 -0500
Here is an illustration to what I was saying: an old sextant that looks nice, but the index mirror is transparent: all silvering is gone. See the third picture in the second column. E-bay item 170047453767. Alex On Tue, 7 Nov 2006 FrankReedCT@aol.com wrote: > I agree. There are still some companies that do mirror "aluminizing" or > "resilvering" for telescope optics. They should be able to do sextant mirrors > which are comparable in size to the secondary mirrors in Newtonian reflectors. > You might try googling "telescope mirror resilvering" etc. Of course, this is > expensive. It may be cheaper to acquire sextant mirror spares and then cut > them to fit an older sextant. > > The prices of high-quality commercial telescopes have declined dramatically > in the past twenty-five years so home-built telescopes, and the cottage > industries that supported them like mirror resilvering, are becoming rarer. But, > wow, you sure can get a great telescope for a modest amount of money! Damn > shame the stars have disappeared... > > -FER > 42.0N 87.7W, or 41.4N 72.1W. > www.HistoricalAtlas.com/lunars > > > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
