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
    Half horizon mirrors
    From: Bill Arden
    Date: 2004 Apr 27, 12:14 EDT
    In the case of a sextant with a truncated horizon-mirror (i.e. no
    clear-glass portion to look through, just a short mirror to look past) then
    presumably such a "rising-piece?" would be able to dim this "ghost-image"
    of the Sun right down to nothing, if the telescope shifted far enough. You
    could try it for yourself by grinding-away the unsilvered part of your
    horizon mirror (though I doubt if many will...).

    George
     
    Or you could use a Davis Model 3, which has such a truncated mirror.  8^)
     
    Bill Arden
       
    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