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: How does the AstraIIIb split mirror work?
    From: Paul Hirose
    Date: 2004 Apr 23, 11:12 -0700

    I wrote:
    >
    > With a simple experiment Jim should be able to see how much the clear
    > part of the horizon glass is responsible for what he's seeing. Simply
    > cover that half with dark paper, so only the silvered glass can
    > reflect rays back to the telescope.
    
    Sorry, I assumed it would be obvious the rear surface (nearest to the
    telescope) must be covered. I should have stated that clearly.
    
    
    

       
    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