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
    First surface mirrors - Artificial horizon
    From: UNK
    Date: 2012 Jan 12, 19:27 -0800

    Hi All,
    I've been lurking after being a member of the group about 5 years ago.

    You may also want to try http://www.sciplus.com/
    They have No 68361 - a 77 x 194 x 3 mm first surface mirror for $3.75 and No 12493 - a 7 5/8" x 6 1/8" first surface mirror with some mounting rails for $3.75.

    I got a nice first surface mirror about 12" x 12" out of an old microfilm reader.

    I read about the detailed grinding of a level with interest. Any opinions on a level with an infinite radius - a straight section of tube with a bubble? It seems if you could get the bubble anywhere but one end, or even when it changed ends, you'd be really close to level.
    Regards, Noell Wilson

    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]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