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
    Poor Line of Position Computer
    From: Chuck Griffiths
    Date: 2002 Feb 19, 12:44 -0500

    Has anyone seen or used a Poor Line of Position Computer? Of all the mechanical
    devices described in Bowditch in the history of sight reduction section it
    appears to have been a device that should have been popular. For anyone not
    familiar, it's described as a circular slide rule device with multiple rings
    that could solve the cosine haversine equation to a tabulated accuracy of 10'
    with further interpolation possible. It's not clear however just how big one is
    or whether they were ever very widely used. I can't help but wonder if they
    would have been more popular had the inventor Charles Poor not chosen to market
    the device under his surname.
    
    Chuck Griffiths
    
    
    **********************************************************************
    This e-mail and any files transmitted with it are confidential and may
    be legally privileged or otherwise exempt from disclosure under
    applicable law. This e-mail and its files are intended solely for
    the individual or entity to whom they are addressed and their content
    is the property of Smiths Aerospace.  If you are not the intended
    recipient, please do not read, copy, use or disclose this communication.
    If you have received this e-mail in error please notify the e-mail
    administrator at postmaster{at}si.com and then delete this e-mail, its
    files and any copies.
    
    This footnote also confirms that this e-mail message has been scanned
    for the presence of known computer viruses.
    ***********************************************************************
    
    
    

       
    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