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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Scope mounting on vernier sextant?
From: Brad Morris
Date: 2013 Dec 10, 11:25 -0500
From: Brad Morris
Date: 2013 Dec 10, 11:25 -0500
I also do not see a rising telescope. It appears to be fixed height. The base of the scope mount is bolted through the sextant frame.
I also do not see an adjustment for collimation, or the tilt of the scope towards / away from the plane of the frame of the sextant.
Brad
On Dec 10, 2013 9:41 AM, "Alexandre Eremenko" <eremenko@math.purdue.edu> wrote:
It does not look like a reproduction, but it really does not have the rising piece. When you see it you can check. Alex. > I'm supposed to go Thursday to look at my "final" extant purchase - an > old, full size, vernier sextant. So far almost everything in the photos > checks out but I'm wondering about the scope mounting system. I don't see > a rising piece or a method of adjusting the sight path of the scope - > attached photos. I would have expected those two features on one of these > works of art. > > The adjustable split mounting ring for the scope might be obscured by > corrosion but I don't see any sort of rising piece. Were some of these old > sextants made without these features, has there been a modification to > this one, am I being offered the world's best reproduction, or am I > missing something obvious in the photos and about to publicly embarrass > myself? > Regards, Noell > ---------------------------------------------------------------- > 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 > ---------------------------------------------------------------- > > Attached File: http://fer3.com/arc/imgx/Vernier-rising-piece.pdf > Attached File: http://fer3.com/arc/imgx/Vernier-scope-ring.pdf > > > : http://fer3.com/arc/m2.aspx?i=125705 > > > >