Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    Name or NavList Code:
    Email:
       
    Reply
    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

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.
    Email:

    Email Settings

    NavList ID Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site