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    Re: Making an artificial horizon
    From: Gary LaPook
    Date: 2011 Jan 19, 21:56 -0800
    We've gone around before about mercury. There are very toxic organic compounds involving mercury but you can drink pure mercury and it just passes through you without harm. The "mad hatter" breathed mercury fumes over long term exposures which had bad results. It has had a long history for use in artificial horizons, ask Lewis and Clark. It does evaporate very slowly so don't keep the bottle in you bedroom but, otherwise, the limited exposure to fumes during the occasional use as an artificial horizon will not cause you any harm. And there is no fluid that is more reflective than mercury for use in an artificial horizon, just try to shoot stars with water or oil!


    --- On Wed, 1/19/11, Alan <alan202@verizon.net> wrote:

    From: Alan <alan202@verizon.net>
    Subject: [NavList] Re: Making an artificial horizon
    To: NavList@fer3.com
    Date: Wednesday, January 19, 2011, 9:22 PM


    Having read GL's post, I too wondered about the mercury he mentions. Of course who knows how many years have passed since he made the artificial horizon mentioned, for as you say, things have changed. Of course, on the subject of change, P.O. Ackley once offered the following. "while change indicates movement, it isn't always movement in the direction of improvement".
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