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: Bygrave formula
    From: Francis Upchurch
    Date: 2014 Jun 8, 22:54 -0700

    Hanno,

    no worries re the names slip!

    I attach build details for the Bygrave and Fuller 2 replicas.They are both as accurate as the originals. I have since built probably my most useful slide rule (still prototype) A mini Fuller 2,  reduced size (same size as Bygrave) (photoshop), using 2 multiplication/division scales and one log sin scale from the original, but I have re-fromatted in the style of the Otis King, with no vulnerable metal cursers which do not work well on a bouncing boat! (more later, but it is faster and just as accurate (to 4-5+ decimal places).

    With regard to your idea,I will probably need a simple picture of how your 3 cursers fit over the single log scale. I assume I can use either the log sin scale from the Fuller, or the log cos scale from the Bygrave? Now where and how do the 3 transparent tube cursers go and how do you do the calculation?

    I can do the cosine formula no problem with the Fuller 2, but using it as a conventional slide rule with multiplication and division.(details also attached.)

    Building either is easy with minimal craft skills as long as you have the scales in PDF and can re-size on something like photoshop.No parallax type problems with the tubes/curser tubes, if everthing kept very close together (tight fit)

    Thanks for the kind thoughts re surgery pending. I'm like a beached whale until over that! But Im taking my mini Fuller 2 to the hopsital with me ,just in case!

    keep in touch

    Best francis

       
    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