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An aluminum clip board should provide the required flatness for the
transparency overlay task.

On Feb 25, 9:47�am,  wrote:
> I would like to share some experience in using this (transparency over 
printed) style of the slide rule. The surface it is placed for calculation 
MUST BE ABSOLUTELY flat. Even small warping of the surface (such as normally 
found on small plastic tables) leads to big errors in calculations.
>
> From: glapook---NET
> Date: Tues, Feb 24 2009 12:06 pm> There are often posts on the Navlist 
regarding using celestial as a backup to
> > GPS and finding a simple way to do this. I think I have found a method that
> > is simple, self contained, takes up little space, needs no almanac or sight
> > reduction tables
>
> ...
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