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: Sextants and Glue [was Sisteco Prismatic Compass]
    From: Fred Hebard
    Date: 2004 Mar 20, 08:56 -0500

    Jared,
    
    I believe my sextant is the C&P Professional Sextant, as referred to on
    their website.  However, I am not familiar with older designs.
    
    It has 3 horizon and 4 index filters plus an astigmatizer added to the
    the index filter rack.  There is no added button on the micrometer dial
    for adjusting for dip and index error.  The mirror housings are
    aluminum, as best as I can tell.
    
    Most lens systems I have disassembled glued the compound lenses
    together, but mounted them with threaded rings in the barrel.
    Retaining clips also could be used for filters.
    
    If it's so easy to replace, do you know how I might dissolve the old
    glue clinging to the two horizon filters that have fallen out and what
    sort of glue I should use to replace them?
    
    Fred
    
    
    
    On Mar 19, 2004, at 8:02 PM, Jared Sherman wrote:
    
    > Fred, I would bear in mind that most of the finest camera lenses in the
    > world today are in fact built up from multiple elements--glued
    > together.
    > Glue is literally the stuff that makes precision optics possible today.
    >
    > If the alignment and material selection is done properly, the glue
    > joint is
    > stronger, lighter, and thinner than screwed metal rings. It will never
    > seize
    > up, and it is easily replaced when and if need be.
    >
    > There are also combat aircraft whose wings are literally glued on.
    > Glue is
    > not necessarily a bad thing! And if it happens to keep down the cost
    > of the
    > sextant, even better.
    >
    > Which sextant did you get? How big is the filter rack on it? (How many
    > filters?)
    >
    
    
    

       
    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