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    Re: Cylindrical Slide Rules
    From: Wolfgang K�berer
    Date: 2006 Nov 6, 13:09 +0100

    Dear all, 
    Otto van Poelje has already mentioned the article "Die
    Navigationsrechenschieber MHR1 und HR2 f�r die Kriegsmarine" by Henning
    Pohlmann in: K�hn, Klaus und Karl Kleine, Dennert & Pape ARISTO 1872-1978,
    M�nchen 2004, 264 - 267. The manual can be found on the accompanying CD-ROM.
    This book also contains an article (in English) on the little known nautical
    slide rules by Robert Nelting: Kugel, G�nther, The Nautical Slide Rules no.
    28 - 31 in the D & P-catalogue of 1914. 
    There is another article in German: Komorowski, Uli, Der
    Besteckh�henrechenschieber, in: Piekfall, Nr. 84 (2004), 23 - 30. This
    should be rather hard to get outside of Germany, so if anybody would like a
    copy I could send a scan off-list.
    You can also find an article on the MHR 1 and the Bygrave slide rule by Ray
    Hems in: Skid Stick, Issue 17 (June 2004) (this is the journal of the United
    Kingdom Slide Rule Circle).
    Some time ago there was a very instructive contribution on the web by Dr.
    Serge Savoysky (in french). That page has disappeared in the meantime, but I
    have made a printout, so if anybody is interested...
    How many MHR1s were produced may be found out from the Dennert & Pape
    archives which are held now by the "Deutsches Museum" in M�nchen. They seem
    to be rather rare these days: one supposedly went for US$ 1080 on ebay a
    couple of years ago. But one can be lucky, as I picked up mine for about
    20�� from an antique dealer in Frankfurt.
    The "Deutsches Museum" holds at least one MHR1 and one MHR2. Two others were
    to be discarded as trash in the 70s by the "Marineoffiziersschule" in
    Flensburg-M�rwik, when a knowlegeable soul saved them; they are said to be
    in the "Marinemuseum" in Wilhelmshaven. Another one is supposedly in the
    "Schiffahrtsmuseum" in Flensburg.
    The Bygrave slide rule is somewhat older than the MHR1, it was patented in
    1920/1921 by Leonard Bygrave. You can find the patent via Espacenet (Patent
    number GB 162,895). There is an article by Colin Barnes "Henry Hughes & Son
    Limited and the Bygrave Slide Rule" in the "Slide Rule Gazette" (also of the
    United Kingdom Slide Rule Circle), Inaugural Issue Autumn 2000, 7 - 11.
    Finally there was a Japanese version of the Bygrave; Mystic Seaport holds
    such an instrument (Accession number 1957,618), which you can see at
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