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    Re: Artificial horizons
    From: Trevor Kenchington
    Date: 2003 Jul 11, 01:29 -0300

    Your problem would be getting the mirror to float level, not trimmed by
    bow or stern, nor with a list to port or starboard. Getting a flat,
    floating mirror surface shouldn't be difficult and one that maintained a
    constant orientation to the vertical wouldn't pose any insuperable
    challenges. But getting that flat mirror to also be level, to better
    than a tenth of a minute of arc to match the precision of a sextant
    observation, would be a tall order.
    You certainly wouldn't do it by sticking a few bits of styrofoam to the
    back of the mirror.
    Trevor Kenchington
    Bill Arden wrote:
    > This thread has gotten me to thinking ...
    > The best thing about a liquid artificial horizon is that it is
    > gravitationally driven to be flat and level, but it suffers from breezes.
    > The best thing about a mirror artificial horizon is that it's
    > permanently flat, but it's hard to make it level.
    > Has anybody tried floating a mirror on a liquid bath? You could glue it
    > to a piece of styrofoam, and if it were only slightly smaller than the
    > pan it's floating in, there wouldn't be much room for wind to disturb
    > the liquid.
    > I haven't tried it (this is just a gedanken experiment) - has anybody else?
    > Regards,
    > Bill Arden
    Trevor J. Kenchington PhD                         Gadus@iStar.ca
    Gadus Associates,                                 Office(902) 889-9250
    R.R.#1, Musquodoboit Harbour,                     Fax   (902) 889-9251
    Nova Scotia  B0J 2L0, CANADA                      Home  (902) 889-3555
                         Science Serving the Fisheries

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