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: Scope position relative to frame 2
    From: Bill B
    Date: 2007 Jan 26, 21:36 -0500

    Sorry to be thick as a brick on this.  I did find an article Frank had
    posted, "Sextant Telescope Collimation," 10-18-05
    
    I guess my handicap is not being able to translate the word picture into a
    mental image.
    
    If I superimpose two images in the center of the scope and keep the
    directly-viewed image centered and rotate around scope's axis, the image
    viewed via the index mirror will slide left or right using a plumb sextant
    frame as a reference.
    
    What I suspect is a movement more like assembling a panoramic from several
    camera photographs.  If the scope had cross hairs, when the sextant frame
    was in the normal plumb position, we could label the horizontal cross hair
    "x" and the vertical crosshair "y".  With the two images superimposed at the
    crosshair junction, the "rotation" motion needed would slide the bodies to
    either side of the y crosshair while keeping them on the x crosshair.  Equal
    distance from the y crosshair of the image nearest the y crosshair should
    create equal separation between the bodies.
    
    Do I have it yet?
    
    Thanks for your patience.
    
    Bill
    
    
    --~--~---------~--~----~------------~-------~--~----~
    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