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    Re: Traditional navigation by slide rule
    From: Paul Hirose
    Date: 2016 Oct 28, 16:35 -0700

    On 2016-10-28 13:13, Bob Goethe wrote:
    > I see that Excel 2013 has an LN() function available to it...but the flavor 
    of Visual Basic which I have integrated with my graphics program, CorelDraw, 
    does not support this function per se.
    If your Visual Basic is like mine, Log(x) returns the natural logarithm
    of x, and Log10(x) the base 10 logarithm. Log() can also be called with
    two parameters: Log(x, y) returns the base y log of x.
    If space for the scale is an issue, maybe the ln scale could go on the
    back of the slide. The simple "Mannheim" slide rule has one face on the
    body but the slide is double faced: B, CI, and C one side, S, L, and T
    on the other. For trigonometric or logarithmic computations, you pull
    out the slide and flip it over.
    Possible useful additions to your slide rule are gauge marks for minutes
    and seconds:

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