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
    Name or NavList Code:
    Email:
       
    Reply
    Re: My ultimate artificial horizon rig
    From: Randall Morrow
    Date: 2013 May 10, 12:38 -0700

    Norm,
    You are coprrect. The AH mirror shown is a second surface mirror. I had previously installed a first surface, which I liked better and at low angles, it probably gave more accuracy. It certainly decreases "visual ambiguity" as to the exact center or exact tangency of a sight. But the errors are likely within the margins of error for all the other factors involved in sight taking so it is not important to me. I will trade up to a fisrt surface as soon as I can, but mainly to make what I see more pleasant to see, (no blurring) than to get accuracy improvements. I was not aware of the issue of "wedge angle" and assumed the second surface abberations were due to there being 2 reflections that separate from each other as the angle of view decreases.

    The 10 second vials are over-kill of course, again because of the many other sources of error. In an earlier post I mentioned a hardware store torpedo level that was aouund 10 minutes accuracy and costs $10.00. But I enjoyed the project and mine look way cooler! It is something of an attempt to create the antique AH with 2 spirit levels such as the Elliot. (picture attached) Something like this was used on many explorations such as Amundson at the south pole. Thank you for sharing your comments. Regards, Randy
    ----------------------------------------------------------------
    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
    ----------------------------------------------------------------

    File:



       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.
    Email:

    Email Settings

    NavList ID 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