NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Making an artificial horizon
From: Gary LaPook
Date: 2013 Aug 15, 22:15 -0700
From: Gary LaPook
Date: 2013 Aug 15, 22:15 -0700
But for star sights you do not want any attenuation.
gl
From: Norm Goldblatt <ngold@pacbell.net>
To: garylapook@pacbell.net
Sent: Thursday, August 15, 2013 12:45 PM
Subject: [NavList] Re: Making an artificial horizon
gl
From: Norm Goldblatt <ngold@pacbell.net>
To: garylapook@pacbell.net
Sent: Thursday, August 15, 2013 12:45 PM
Subject: [NavList] Re: Making an artificial horizon
Yes- we used to play with Mercury all the time. Chase it, dip a dime in it- makes it slippery and glistening. I'm not an MD, Thomas, but if you knew me, you'd know I suffered no ill effects- according to me, not my wife! HAHA!
I'm not sure why you would use mercury, tho. Can't you use some attenuation of the Sun? Top surface of water or oil is only about 4% reflection, which seems ideal. Oil seems good because of the viscosity discouraging ripples and because there's some further attenuation suffered from transmission, hence discouraging a second reflection from bottom. Heck, dirty oil would be even better.
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