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: Freiberger sextant
    From: Alexandre Eremenko
    Date: 2012 Aug 13, 17:52 -0400

    Ridge,
    I 100% agree with your opinion.
    Some sextants have a vernier (on the 1' drum) reading to 0'2.
    Astra, if I remember correctly, and many British sextants.
    I think 1' drum with no vernier is sufficient for all purposes
    a sextant is used in XX century:-)
    
    BTW, speed and certainty of reading is also very important.
    And on my opinion, vernier/drum combination INCREASES the
    chance of blunders. (From my experience with Bill B. Astra).
    
    But a magnifier is great for twilight and for the Lunars:-)
    
    Alex.
    
    
    
    > Given the likelihood that no sextant can repeat a reading down to one
    > tenth
    > of a minute because of tiny amounts of "slop" between the tangent screw
    > and
    > the limb, vernier scales strike us as maybe desirable - but by no means
    > necessary - for accuracy.
    >
    > Just one man's opinion. Anyone else have thoughts on this?
    >
    > Ridge White
    >
    > Robert E. White Instruments
    > PO Box 775
    > Medfield, MA 02052
    >
    > Tel: 617-482-8460
    > Fax: 617-482-8304
    >
    >
    > On Mon, Aug 13, 2012 at 11:33 AM, Jeremy C  wrote:
    >
    >> Hi All,
    >>
    >> I just took a ship from Anchorage Alaska to Singapore. She had onboard a
    >> Freiberger sextant, the first I had seen or used.
    >>
    >> Here's a photo: http://www.flickr.com/photos/37977699@N00/7774059416/
    >>
    >> I can't say that I was too impressed to be honest. It was fairly light,
    >> being all Aluminum, and the shades were nice. The unit was also well
    >> constructed and the movement of the arm and micrometer drum were silky
    >> smooth. Still the non-standard fork precluded the use of my 7x35 scope
    >> which was unfortunate.
    >>
    >> The biggest thing that bothered me was that the micrometer drum had me
    >> interpolate within 1' incriments. For a Lunarian, this is quite
    >> unacceptable. I want to interpolate at 0.1' or 0.2'.
    >>
    >> The weather on the 21 day trip was terrible for stars and shooting in
    >> general for my whole trip. I did manage a few sun lines which worked out
    >> well, but no stars. I will say that shooting at 60 deg N made this the
    >> closest to the pole I've ever shot. It's just too bad there was no
    >> chance
    >> to shoot a round of stars up there.
    >>
    >> Sadly the ship, MV VIRGINIAN, along with the sextant, will be on the
    >> beach
    >> being turned into razor blades in a few weeks, as the owners decided to
    >> sell it for scrap. So much for my second command. I guess that's the way
    >> of
    >> the shipping world.
    >>
    >> Jeremy
    >> ----------------------------------------------------------------
    >> NavList message boards and member settings: www.fer3.com/NavList
    >> Members may optionally receive posts by email.
    >> To cancel email delivery, send a message to NoMail[at]fer3.com
    >> ----------------------------------------------------------------
    >>
    >
    >
    >
    >
    > View and reply to this message: http://fer3.com/arc/m2.aspx?i=120339
    >
    >
    >
    
    
    
    
    

       
    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