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: Floating mirror
    From: David Pike
    Date: 2015 Apr 20, 11:36 -0700

     

    Isn’t there a tendency for surface tension to pull a light mirror to the edge of the container?
    I found two problems with my “wet” AH experiments at 53N in winter.  Unless dead calm, the wind causes ripples on water, and the height of the edges of the container, restricts the minimum value of Hs which can be recorded.  Thick, black engine oil allows use in slightly stronger winds, but carrying the near full container back into the house risks a dreadful calamity.  That’s why I went for a good strong mirror on a solid adjustable base.  I wonder how people like Tycho Brahe worked.  I suspect they measured down from the vertical and made their gear giant size.  Dave 

     

       
    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