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: Sextant frames
    From: Brad Morris
    Date: 2009 May 13, 09:25 -0400

    Hi Bill
    
    Thanks for confirming what should be the standard mode of operation.
    
    Naturally, there are two sources of heating.  One is the radiated energy being 
    applied by the rays of the sun. The other is the atmosphere surrounding the 
    sextant.  If we wanted to analyze the sextant just for radiated energy, we 
    would place the sextant in a vacuum chamber and apply radiated energy.  Hard 
    to operate in the vacuum, but it would separate out the ambient energy from 
    the radiated energy.
    
    What your test shows is that the caution about warming a metal sextant out of 
    the rays of the sun is perhaps a bit over the top.  The distortion of a metal 
    frame, just as theorized, is negligible.
    
    Perhaps you can perform the same experiment with a plastic sextant, where the 
    warming of the radiated energy would predominate over the ambient energy.
    
    Best Regards
    Brad
    
    
    "Confidentiality and Privilege Notice
    The information transmitted by this electronic mail (and any attachments) is 
    being sent by or on behalf of Tactronics; it is intended for the exclusive 
    use of the addressee named above and may constitute information that is 
    privileged or confidential or otherwise legally exempt from disclosure. If 
    you are not the addressee or an employee or agent responsible for delivering 
    this message to same, you are not authorized to retain, read, copy or 
    disseminate this electronic mail (or any attachments) or any part thereof. If 
    you have received this electronic mail (and any attachments) in error, please 
    call us immediately and send written confirmation that same has been deleted 
    from your system. Thank you."
    
    --~--~---------~--~----~------------~-------~--~----~
    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