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: Restoration
    From: Brad Morris
    Date: 2018 Sep 23, 11:10 -0400
    Hello Bill

    In the case of sextants which are approximately more than 75 years old, I would not recommend replacing the mirror glass.  

    Consider the case of a 1700's octant.  Would you replace the mirrors with modern glass?  Likely no, as the antique nature of the artifact argues strongly against that.

    Move into the 1800's and the argument still holds up well.  The object's integrity, it's sum of the parts, argues for resilvering of mirrors.

    It's only when we move into the 1900's that the argument becomes more tenuous.  Sextants made since the dawn of the GPS age arguably are modern and unless the restorer is particularly fastidious, no argument can be made regards the sanctity of the artifact.

    Which leaves me, in my opinion, at or about the 75 year mark.  I'd like to see sextants, of a certain age, retain their components.  That those components be restored to their former glory.  

    The ease of just plopping in a new mirror is very convenient.  I understand that you mean that it is unnecessary to resilver.  That doesn't preclude resilvering where warranted.  I think you mean that too.

    Brad






    On Sun, Sep 23, 2018, 12:39 AM Bill Morris <NoReply_Morris@fer3.com> wrote:

    Frank

    It is nowadays unnecessary to re-silver mirrors, as the float glass from which modern mirror glas is made is flat enough over small areas to do the job. Rectangular mirrors are easy to do oneself, while circular ones need a little more effort. Learn how to do it here: https://sextantbook.com/category/new-sextant-mirrors-for-old/

    Bill Morris

    Pukenui

    New Zealand

    View and reply to this message

       
    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