Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: How does the AstraIIIb split mirror work?
    From: Jim Thompson
    Date: 2004 Apr 25, 06:23 -0300

    > -----Original Message-----
    > From: Ken Muldrew
    > > From: Jim Thompson:
    > > I repeated the experiment, this time blocking the horizon mirror's
    > > clear window from the front.  Not surprisingly I guess, for all 3
    > > sighting devices (sight tube, 4.5x30 and 6x40 telescopes) I only saw
    > > the index mirror's image in the right half of the field of view, and
    > > it stopped sharply at the center of the field of view where the
    > > vertical edge of the mirror ended.
    > This is surprising. When I block my horizon mirror's clear window from
    > the front (leaving the mirrored half unblocked), I see the index mirror's
    > image across the entire field of view with a 5x36 scope.
    > Ken Muldrew.
    By "front" I meant the side toward me, toward the telescope, not the side
    away from me, toward the horizon.  Were we talking about the same "front"?

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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