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Subject: Re: Prism levels to correct sextant tilt.
From: Richard B. Emerson (navsys@XXX.XXX)
Date: Tue Nov 02 1999 - 08:41:20 EST
[...]
> This is pretty much what I had in mind and the idea has been exploited.
> Celestaire used to sell such a prism, which clipped onto the left hand side
> of the horizon glass. They might still do, I have not looked at their
> catalog recently. The claim was that verticality to 0.5 degrees was easily
> achievable using this device, which cost around $40 ten years ago.
Celestaire no longer lists the Davis prisms either in their 2000
catalog or their web page (www.celestaire.com). They can be reached
via e-mail at info@XXX.XXX
One of the benefits of a split horizon mirror is the vertical edge of
the mirror gives a reference line to sequere the sextant with the
horizon. From there, a little rocking is all that's needed to be sure
the sextant is truly vertical.
Rick
S/V One With The Wind, Baba 35
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