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 Jan 9, 09:55 -0800

    I have never seen a slide rule with stripes before, as the Faber-Castelle.  What a creative idea!

    The K&E, of course, keeps sine and cosine values explicit on the single S-Scale.  I wonder if, in building his own slide rule, one should have an SI-scale...an inverted sine scale which would represent cosine values.  That would simplify keeping sine and cosine readings relatively error free.

    It seems like slide rule patents were not for the scales themselves (which have been known for scores of years if not centuries) so much as for the particular arrangement of the scales.  I wonder if Faber-Castelle was somehow able to patent colored stripes.

    Bob Goethe

       
    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