NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Prism levels to correct sextant tilt.
From: Richard B. Emerson
Date: 1999 Nov 02, 6:41 AM
From: Richard B. Emerson
Date: 1999 Nov 02, 6:41 AM
[...] > 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@celestaire.com. 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
