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: New sextant mirrors for old
    From: Bill Morris
    Date: 2009 Feb 11, 17:08 -0800

    Greg wrote
    " The question
    now is how to go about fabricating split and whole horizon mirrors?"
    
    Sorry, I didn't think about split mirrors. I'll edit the blog post in a few hours time to cover them.
    
    Whole horizon beam splitting mirrors shouldn't need replacing. The coating is 
    said to be at least as hard and resistant as glass. I don't have any definite 
    ideas about replacement. The principle is covered in some detail in US Patent 
    number 4,421,407. The requisite material may be available on the surplus 
    market somewhere.
    
    Bill Morris
    Pukenui
    New Zealand
    
    
    
    
    
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email 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