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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Traditional navigation by slide rule
From: Paul Hirose
Date: 2016 Oct 28, 16:35 -0700
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: http://fer3.com/arc/m2.aspx/Traditional-navigation-slide-rule-Hirose-sep-2016-g36680
