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: Cannot focus sextant telescopes
    From: David C
    Date: 2016 Aug 2, 15:42 -0700

    Thanks Bill, you have confirmed my suspicion that a tube is missing. I purchased the sextant 40+ years ago and and the case has hardly been opened in that time apart from a burglary when as far as I know nothing was taken. I suspect the tube was missing when I obtained the sextant but will never know.

    I have  determined the following:

    E screws onto C & D.

    Lens on C unscrews and can be replaced by F.

    C has two lenses so is keplerian?

    A & B are one lens each.

    When I take the lens off C I can see a graticule. This is the first time I have noticed it.

    It is dead reckoning weather outside so I probably will not be working on this anymore today (-;

       
    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