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
    Name or NavList Code:
    Email:
       
    Reply
    Re: Freiberger Trommelsextant errors
    From: Bill Morris
    Date: 2012 Apr 16, 03:03 -0700

    Jared wrote "...when plotted the change resembles a sine wave. If this trouble
    is described in Bill Morris's book, I can't find it."

    Eccentricity error is described simply on page 45 and on page 46, complete with mention of the sine.

    Less obviously, if the axis of the index arm is not at right angles to the plane of the rack or scale, a somewhat similar error will appear. See the post for 20 March 2011 "C Plath Sextant Lives Again" at www. sextantbook.com

    Bill Morris
    Pukenui
    New Zealand


    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

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

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

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

    Email Settings

    NavList ID 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