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    Re: Dennert & Pape MHR-1 HR-2 Cylindrical Slide Line Ruler
    From: Wolfgang K�berer
    Date: 2007 Jul 26, 21:32 +0200

    Dear Max,
    
    these articles contain the information you need about Bygrave slide rules:
    
    Kolbe, Geoffrey,
    Bygrave Slide Rule Revisited.
    in: Navigator's Newsletter, No. 93 (Fall 2006), 10 - 13.
    
    Luykx, John M.
    The Bygrave Position Slide Rule.
    in: Navigator's Newsletter, No. 30 (Fall 1990), 9 - 10.
    
    Barnes, Colin
    Henry Hughes & Son Limited and the Bygrave Slide Rule.
    in: Slide Rule GAZETTE, Inaugural Issue, (Autumn 2000), 7 - 11.
    
    The information about the MHR1 and MHR2 is in German:
    
    Komorowski, Uli
    Der Besteckh�henrechenschieber.
    in: Piekfall, Nr. 84 (2004), 23 - 30.
    
    Pohlmann, Henning
    Die Navigationsrechenschieber MHR1 und MHR2 f�r die Kriegsmarine.
    in: K�hn, Klaus und Karl Kleine (Hrsg.), Dennert & Pape ARISTO 1872-1978 :
    Rechenschieber und mathematisch-geod�tische Instrumente, M�nchen 2004, 264 -
    267.
    
    The ARG1 is an instrument to solve the navigational triangle by means of a
    diagram.
    
    It is described in the following article
    
    Charlwood, David,
    On the Astronomisches Rechengerat ARG1.
    in: Navigator's Newsletter, No. 76 (Summer 2002), 10 - 19.
    
    There is an ARG1 in the National Maritime Museum Greenwich (in storage);
    another one is Royal Navy Submarine Collections (Shelf No. Q35/27/84).
    
    The successor of the ARG1, the ARG3, was still in production in the GDR
    after WWII and in use by the East German Merchant Marine: The 1969 edition
    (reprinted in 1979) of the manual of astronomical navigation by Steinfatt
    and Uhlig contains a chapter on evaluation of star sights by means of the
    ARG3.
    
    In April 2006 an ARG3 was sold on ebay for just over 100 EURO; I doubt that one
    could pick up another one so cheap again.
    
    
    Best regards
    Wolfgang K�berer
    
    -----Urspr�ngliche Nachricht-----
    Von: NavList@fer3.com [mailto:NavList@fer3.com]Im
    Auftrag von MaxU88
    Gesendet: Mittwoch, 25. Juli 2007 20:58
    An: NavList
    Betreff: [NavList 3030] Dennert & Pape MHR-1 HR-2 Cylindrical Slide Line
    Ruler
    
    
    
    Hi All
    
    I'm new to this group,so I thought that I would start with a bit on an
    intro.
    
    My name's Max and I am a collector of memorabilia from the German
    Kriegsmarine of WW2.  My collection can be viewed here at my site:
    www.atlantik-pirat.com
    
    I have decided to join this group, as being a collector of Naval items
    I have a keen interest in Navigational Instruments.
    
    Whilst doing a Google search for some items that I have in my
    collection (and items that I am looking for), I came across an
    archived message regarding a couple of instruments that I have.
    
    The Instruments in question are the Dennert & Pape (gwr) HR-2 and
    MHR-1.  I have neen trying to gather information on these Navi
    Insruments to help understand them a little better.  I know of a few
    in Museums around the Globe and a couple in private collections.  I
    would like to share mine with members of this Group, as these are
    seldom seen anywhere.
    
    If you click on this link (or copy and paste), I have posted a few
    stills for all to see:
    
    http://www.panoramio.com/user/707446
    
    You will also be able to see the rarely seen Bygrave AML Position Line
    Ruler, that the MHR-1 (and the HR-1 Luftwaffe equivalent) was based
    on.
    
    The only other Navigational Instrument that keeps eluding me is the
    Carl Zeiss Jena (blc) ARG-1 (Astronomisches Rechenger�t 1).  This was
    a Luftwaffe intrument, but the Kriegsmarine ordered a small number to
    carry out trials on U-boats.  These proved so successful, they were
    adopted by the U-boat Arm.  The only difference between the Luftwaffe
    and Kriegsmarine instrument, is the letter 'M' on the top of the
    casing.  Everything else (including the FL~~~~ Luftwaffe code)
    remained the same.
    
    If anyone knows of one.....
    
    All the very best and thank you for taking tme to read my post.
    
    Max
    
    
    
    
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