Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Mirror recoating
    From: Alexandre Eremenko
    Date: 2019 Mar 26, 19:02 +0000

    You can experiment even without removing the old coating.
    An alternative to silvering the back surface, is to make it black. So that it 
    does not participate in forming the image at all.
    Removing silvering and making it black
    is much easier than silver/aluminium coating.
    Just try, and see what happens with your glasses in their present state.
    What you will see depends on the state of the remaining silvering.
    You may see two reflections, but I expect it will be easy to tell
    which is which. They will be of different brightness.
    P.S. I can find an old recipe for "silvering" sextant mirrors with mercury,
    if you are interested. (Mercury is considered nowadays a dangerous substance to work with).
    A supply of mercury was usually available for use in an artificial horizon in old times.
    When I was a boy, I silvered things with real silver, using the spent solutions from 
    photo film/prints development. (In those times we all developed our films 
    ourselves, using a chemical process,
    and I byproduct of this process was a solution which contained enough silver.)

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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