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: Vernier reading
    From: Alexandre Eremenko
    Date: 2007 Jan 7, 18:39 -0500

    
    Extra subdivisions to the
    right of 0 and to the left of 10'
    are for your convenience.
    
    When you look at the main scale, you may see
    that 0 of the vernier is almost against
    some main scale division (for example, against zero
    on the main scale).
    
    You are not sure, whether the angle is actually a bit
    less than zero or a bit more than that.
    
    Now you look at the vernier through the magnifying glass.
    If the true angle is really close to zero,
    you do not have to examine all vernier. You just look
    a bit left and right of zero.
    
    Alex.
    
    On Sat, 6 Jan 2007, Jim wrote:
    
    >
    >
    > Sirs,
    >       I have recently purchased an Heath&Co Vernier sextant?.The
    > Vernier has the usual 10' divisions,each with
    five 12"subdivisions.My
    > problem is,
    that there are three 12"divisions to the left of 10', and
    > three to right of 0'.What is the purpose for this?.Incidentally the
    > main arc reads to 150deg.,hence my query against the use of sextant.The
    > certificate is dated 1940
    >
    >                            Jim Martin.
    >
    >
    > >
    >
    
    
    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to 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