Check out the bookstore at IRBS.com
| Home | Mailing Lists | Bookstore | Weather | Tide Predictions | Bowditch |

Re: Sextant design. [was: Another Davis...}

Subject: Re: Sextant design. [was: Another Davis...}
From: Fred Hebard (Fred@XXX.XXX)
Date: Mon Mar 03 2003 - 21:24:38 EST

George Huxtable wrote:

>1. Why does a split-horixon mirror have a piece of plain glass
alongside
>the mirrored part, for the horizon to be seen through? Why not just
chop
>that part off? What good does that plain glass do? I've asked that
question
>before, and ask it again in the hope of getting further answers.

George, I have a Davis with the chopped off horizon mirror, which makes
it much more difficult to use than my Husun, which has a half-silvered
horizon mirror. In the Husun, there is some illusion (?, or perhaps
reflection from the front of the mirror) of the two images becoming
superimposed, rather than split in half. Also, the edge of the chopped
mirror in the Davis divides the field of view, making it more difficult
still to match up the two images; they are separated by a thick line.

Fred



| Home | Mailing Lists | Bookstore | Weather | Tide Predictions | Bowditch | Trawlerworld |