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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
http://www.mysticseaport.org/research/nimath.cfm?mpage=2#219

Regards,

Wolfgang


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