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: Index corr., Octant as dipmeter
    From: Alexandre Eremenko
    Date: 2004 Nov 20, 22:30 -0500

    Dear Jared,
    On Sat, 20 Nov 2004, Jared Sherman wrote:
    > If  a dip meter is a useful instrument,
    > why were they never popular and now
    > extinct?
    The short answer is "I don't know". And I am not sure
    "they were never popular". The more expanded ans is:
    1. From the Russian manual I read in the late 60-s
    I conclude that one of these devices WAS common in
    Soviet Union in 1960-s. The author of the book referred to it as
    something well-known and available, and even did not care
    to describe it, just strongly recommended to
    use it instead of the tables. This was a short manual for
    a practical navigator,
    not a scientific book.
    2. From the messages of Fred and George I know that in the
    West they experimented with these devices.
    However, 3 different models of Western dipmeters
    were mentioned in these messages: the Zeiss, Blith and Gavrishev.
    It is not clear to me whether these were unique experimental
    devices or serial production.
    Maybe the paper describing these experiments,
    which Fred promised to send me can shed some light on
    your question.
    3. One explanation offered on this list was that in the
    open sea there is simply no need in very precise Cel Nav.
    It was noticed that such need happens in certain special
    tasks like cable laying operations, but who knows, maybe
    those people indeed used dipmeters.
    4. Whether it is typical or exceptional that the dip is
    different in various directions, I don't know.
    If this is common, then dipmeter is useless, of course.
    5. I wonder what precision can an advanced bubble attachemet
    give. Does anyone on this list have experience with
    Cassens-Plath bubble horizon, for example?
    Could it be that mariners found it superior to
    any dipmeter?
    Of course, it has additional advantage in that it does
    not use any horizon at all.

    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