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: Cleaning arc of Vernier sextant.
    From: Alexandre Eremenko
    Date: 2006 Oct 28, 18:35 -0400

    
    I almost completely agree with George in his answer to
    this question:
    
    > George, once you decided to acquire a metal sextant,
    > why didn't you just go
    > the whole way and purchase a micrometer
    > drum sextant?
    
    I say "almost" because it is not evident at all to me
    that the drum sextants are "technicaly superior",
    the thing which seems somehow to be accepted in this
    discussion.
    
    I agree that the drum sextants are easier to use
    (and probably cheaper make, with modern technology)
    However, I it is not evident at all that they are
    superior in accuracy.
    
    Notice: the drum sextants were introduced when nobody
    was already taking lunars, and when 0'5 accuracy was
    considered sufficient. I suspect that they sacrificed
    extra precision to economy and convenience of use.
    This is only a conjecture, of course.
    
    But I am also looking for a good 10" vernier sextant,
    essentially for the same reasons as George.
    When I get one, I can test my conjecture:-)
    
    At this time I own one drum sextant (SNO) and
    a pocket vernier sextant (Troughton and Simms),
    where the tiny scale can be read only to 1'.
    But I am very much satisfied with this little
    toy.
    Even reading the fine silver scale through the
    magnifying glass is fun:-)
    
    Alex.
    
    
    
    --~--~---------~--~----~------------~-------~--~----~
    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