Welcome to the NavList Message Boards.


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

Compose Your Message

Add Images & Files
    Re: Horizontal Sextant angles plot.
    From: George Huxtable
    Date: 2010 Nov 29, 21:32 -0000

    I don't follow what Byron is telling us, in writing-
    "The idea is very old as Capt. Fry's tables for construction of the
    diagram. My new use was the adding of the  10 cent compass to mark the
    perpendiclar for the scale for the center of the circle. Perhaps you should
    read it again. I said I was going to use Capt Fry's table from my 1919
    Wrinles in Navigation. My way of contruction "only" was new. "
    Yes there's a simple geometrical construction, which allows the centre of
    the circle to be placed, and the locus then drawn in. And repeated for a
    second circle to get an intersection. I presume that was Byron's
    revelation, when he writes "My way of construction "only" was new.".
    As far as I can follow Lecky, he seems to have missed out on that simple
    construction, instead using traverse tables to work out the position of the
    centre. And he recommends Fry's table, another way of calculating the
    radius of the circle.
    It's the simple method of construction, using no tables, but basic
    geometry, that's been taught to British navigators for years. Is that what
    Byron is claiming to have independently rediscovered? Or have I, and Peter
    Hakel,  misunderstood him? Perhaps Byron will clarify exactly what was his
    "new" method of construction.
    contact George Huxtable, at george{at}hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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