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
    Book about Plath.
    From: George Huxtable
    Date: 2006 Oct 12, 23:16 +0100

    I wonder if anyone has a copy of, or has easy access to, "From sextant
    to satellite navigation", by Friedrich Jerchow, which was published in
    1987, in English and in German?
    
    The question that I am trying to resolve was asked a long time ago on
    the old Nav-l mailing list and still awaits a proper answer. It is
    this: "When, and by whom, was the first true micrometer sextant
    introduced?"
    
    Jean Randier, in "Marine Navigation Instruments", of which I have the
    1980 English edition, shows on page 119 a page from a Plath catalogue.
    This illustrates a quintant, a wider version of the sextant, used
    particularly by hydrographers, described as "Vermessungsquintant mit
    Trommelablesung". This undoubtedly has all the vital characteristics
    of a modern micrometer sextant.
    
    Below it on the page is a "Loth-sextant", which appears to show the
    standard Vernier (= nonius) instrument of the time. So it appears that
    the catalogue is at a transition-date, between the two technologies.
    
    The question at issue is the date of that catalogue. Randier describes
    it as "published about 1902", but that is irritatingly indefinite; to
    me, that catalogue doesn't look as though it had such an early date.
    
    So that leaves the date of the introduction of the Plath micrometer
    quintant still somewhat open. I wonder if the Jerchow book referred to
    above, which I think was published by Plath, offers any clues about
    that date?
    
    George.
    
    contact George Huxtable at george@huxtable.u-net.com
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    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