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: Trombone Kamal Prototype
    From: Greg Rudzinski
    Date: 2009 Jun 5, 16:54 -0700

    George,
    
    Great story;-) When I first calibrated my Sunrule I went through a
    similar process except that instead of a horse trough I used a distant
    mountain peak. The baseline of the Sunrule is ball chain with each
    ball 3mm from the next. I kept cutting off balls until the Sunrule
    matched my sextant reading.
    
    Greg
    
    On Jun 5, 4:20�pm, "George Huxtable"  wrote:
    > About calibrating a cross-staff: I have this little scene in my mind of how
    > a cross-staff maker might ply his trade.
    >
    > The erstwhile navigator enters, saying that he wishes to buy. The proprietor
    > fetches one of his stock out of the window. All these stock items have been
    > made with the staff a bit extra-long.
    >
    > "Stand exactly at this spot, the navigator is told, and with this instrument
    > held by your eye, tell me the angle you make it between yonder horse-trough
    > in the yard, and the baker's chimneytop across the alley."
    >
    > and a moment later- "twenty two degrees and fortytwo minutes, you say? I'll
    > soon fix that". He takes it into his workshop, and knowing that the angle
    > should be 23� 15', can work out exactly how much to remove from the end of
    > the staff to bring the reading up to scratch.
    >
    > The mariner is asked to try again, and presuming that his reading is now the
    > correct one, money changes hands, and both parties are happy, with the
    > instrument now tailored to suit his own skull dimensions..
    >
    > This is a scene that could be repeated over many years, as long as nobody
    > shifted the horse-trough.
    >
    > That's just imagination. I have no idea whether that's the way it was done,
    > but it's possible.
    >
    > George.
    >
    > contact George Huxtable, at �geo...{at}hux.me.uk
    > or at +44 1865 820222 (from UK, 01865 820222)
    > or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    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