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: Don't do this to a sextant
    From: Alexandre Eremenko
    Date: 2006 Nov 8, 00:57 -0500

    Here is an illustration to what I was saying:
    an old sextant that looks nice,
    but the index mirror is transparent: all silvering is gone.
    See the third picture in the second column.
    E-bay item 170047453767.
    On Tue, 7 Nov 2006 FrankReedCT@aol.com wrote:
    > I agree. There are still some companies that do mirror "aluminizing" or
    > "resilvering" for telescope optics. They should be able to do sextant  mirrors
    > which are comparable in size to the secondary mirrors in Newtonian  reflectors.
    > You might try googling "telescope mirror resilvering" etc. Of  course, this is
    > expensive. It may be cheaper to acquire sextant mirror  spares and then cut
    > them to fit an older sextant.
    > The prices of high-quality commercial telescopes have declined dramatically
    > in the past twenty-five years so home-built telescopes,  and the cottage
    > industries that supported them like mirror  resilvering, are becoming rarer. But,
    > wow, you sure can get a great  telescope for a modest amount of money! Damn
    > shame the stars have  disappeared...
    > -FER
    > 42.0N  87.7W, or 41.4N  72.1W.
    > www.HistoricalAtlas.com/lunars
    > >
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to NavList-unsubscribe@fer3.com

    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