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Re: SNO sextants
From: Joel Jacobs
Date: 2004 Nov 11, 11:50 +0000
From: Joel Jacobs
Date: 2004 Nov 11, 11:50 +0000
Alex,
Its not the screw. Its the spring clips that hold the mirror in place. Have you made sure they are tight. You did say your sextant was new, but they have lost there tension so the mirror is floating.
I am surprised you get such accurate results. ;-)
Joel Jacobs
-------------- Original message from Alexandre Eremenko <eremenko@MATH.PURDUE.EDU>: --------------
> Lee,
> thank you very much:
>
> On Thu, 11 Nov 2004, Lee Martin wrote:
>
> > Finally, might I note that many of the texts
> > on sextant maintenance (Bauer,
> > etc) refer to the "much loved" or "tortured" sextant syndrome.
> > They are
> > referring to the sextant being constantly fiddled with, adjusted,
>
> Yes, I read this. That's why I am trying keep it clean too...
> but the temptation to see "what is inside the drum" is strong:-)
> Sometimes some dark grease comes out of it in small
> quantities and I have to wipe the arc.
>
> Speaking of adjustment of SNO-T, this issue was already
> addressed by Lisa: the screw that adjusts the ho! rizon mirror
> perpendicularity is
> a) over-sensitive and
> b) works in a funny way:
> you adjust it and it "plays back". Furthermore, I found that
> sometimes it apparently "plays back" even when I don't touch it.
> So unfortunately this mirror needs frequent adjustment;
> it does not "hold" well its adjusted position.
>
> It cannot be worn out: I bought my sextant "new"
> and everything looks new. It was in a
> factory
> wrapping, rubber parts covered with talc, etc.
>
> Alex.
