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: Old Sextant on German money
    From: Alexandre Eremenko
    Date: 2007 Mar 9, 14:15 -0500

    Dear George,
    It is nice to hear (read:-) from you again,
    I was already beginning
    to worry, where did you disappear from the list:-)
    I will reply your very interesting message separately,
    but now let me recall that I am planning a trip to
    England for two months (June-July) and it will be very nice
    if you send me your address and telephone number
    so that we schedule a meeting.
    Certainly you do not have to post this private info
    on the list: my e-mail is eremenko---.edu
    Hope to see you this summer,
    P.S. Just for the case you missed it: I finally bought
    a vernier sextant. This is a C. Plath pentant, with all
    classical features: 7 1/2 inches arc, divided on
    silver to 10", with a reading microscope, and light diffusor,
    fully adjustable telescope fork
    (collimation and transversal displacement,)
    3 telescopes (approx. 12x inverting, 6x straight, and 3x night scope)
    plus a zero-magnification tube and a dark eyepiece filter for
    checking IC from Sun.
    Everything is in working condition, the
    arm moves very smoothly, though I had to clean it a lot,
    and to adjust.
    I cleaned the arc (which was so dirty that it was impossible to read)
    with oil. Just put some oil and wipe it hard with paper napkin.
    Now it shines:-) I disassembled, oiled and cleaned the vernier
    assembly and the horizon mirror assembly with the adjusting screws.
    Now the arc is readable, only have some dark oxidation spots
    in some places. I had no chance to make many observations yet,
    except the IC and some star distances.
    Short distances were fine, but the long ones not.
    I still have to adjust the collimation.
    Unfortunately, the wires in the inverting scope I broken
    and I had to remove them. (I saw this on many old sextants).
    Apparently people just push something inside to
    clean the lenses, and do not notice these wires which are
    much thinner than ordinary hair.
    I suppose that in the future I will try to find very thin
    wire and glue the wires into the scope, though this is a
    VERY high precision operation.
    At least for me:-)
    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