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    Re: Traditional navigation by slide rule
    From: Bob Goethe
    Date: 2016 Nov 3, 23:52 -0700

    Dear Colleagues:

    I am attaching a rough draft (in both letter and legal size PDFs) of the Mark 2 Navigator's Slide Rule.  The differences between the Mark 1 and the Mark 2 are:

    • The Mark 2 includes hash marks for the value π on the C and D scales.
    • The Mark 2 includes a natural log scale, Ln, on the slide.
    • Consequently, the Mark 2 is slightly larger, from bottom to top, than the Mark 1.

    Line-placement calculations for π and for e, where e forms the basis for the Ln scale, were done to 9 decimal places.

    The objective that stands behind the modifications of the Mark 2 is to be able to do rhumb line calculations.  I welcome your observations and suggestions.

    Bob



    File:
    2016.11.04-Full-Scale-Paper-Version-Letter-sized.pdf

    File:
    2016.11.04-Full-Scale-Paper-Version.pdf

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