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
    or...
       
    Reply
    Re: Traditional navigation by slide rule
    From: Francis Upchurch
    Date: 2016 Jan 16, 07:35 -0800

    Bob,

    photos of my latest miniFuller2 with sines and cosines marked in degrees and minutes and generally accurate to 1' except at the "squashed" ends of the scales. 

    The design format is my own, based on the Otis King which has 2 identical A/B scales(see attached of  both for comparison) Mine has that plus sine scale in black with cosines in red going the other way.

    This slide rule does all the celnav triangle calculations to 4-7 decimal places, so for me is the ideal general purpose CelNav slide rule.This one is robust and seaworthy too.

    I find the simple cylindrical slide rules easy and cheap to build with plastic drain pipe off- cuts and very little precision engineering, other than printing, cutting and lining up the computer generated scales. 

    Build details on request.

    Best wishes

    Francis



    File:



    File:



    File:



    File:



       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

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

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

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

    Email Settings

    Posting 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