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: sextant precision.
    From: George Huxtable
    Date: 2005 Jun 25, 20:26 +0100

    Bill wrote-
    
    My Astra IIB Deluxe, like Alex's SNO-T, has a front-silvered index mirror.
    >Like Alex I have to use gauge blocks to align the index mirror.
    
    That may indeed be necessary, as Bill says. But that doesn't NECESSARILY
    follow from the fact that his index mirror is front silvered. Only if the
    front-silvered reflecting surface is displaced from the pivot axis will
    that be the case. If the framing of a front-silvered mirror has been
    designed to align the reflecting plane with the pivot axis of the index
    arm, then he should be able to eyeball the continuity of the line of the
    arc, just as before.
    
    George.
    ===============================================================
    Contact George at george---.u-net.com ,or by phone +44 1865 820222,
    or from within UK 01865 820222.
    Or by post- George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13
    5HX, UK.
    
    
    

       
    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