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    Re: Dennert & Pape MHR-1 Dennert & Pape MHR-1
    From: Wolfgang Hasper
    Date: 2013 Jan 30, 20:50 +0100

    Brad,
    thanks very much for the compliments and this rapid and
    exhaustive survey of the base!
    I machined 20 groves of 5mm each and am very pleased
    with the result.
    I will be happy to contact as regards further
    clarifications, but am optimistic things are rather
    complete now.
    With things sorted like they are now, I am tempted to
    start a little batch of rules, wish I had more
    time ;o)
    
    Best
    Wolfgang
    
    Am Montag, 28. Januar 2013 00:18 schrieb Brad Morris:
    > Hi Wolfgang
    >
    > 20 grooves around on mine.  The grooves have sharp
    > corners, not rounded.
    >
    > I measured, using a linear scale,just shy of 13/64
    > of an inch.  13/64 *25.4= 5.159 mm.  Since its shy
    > of 13/64, 5mm is probably right.
    >
    > There are also 20 bars, at the same dimension.  Thus
    > we have 40 units of 5mm or 200mm circumference.
    > This yields a diameter of 63.662 mm.
    >
    > The step size is 3/64 of an inch (1.19 mm).  Again,
    > these are square steps
    >
    > Best Regards
    > Brad Morris
    >
    > On Jan 27, 2013 3:16 PM, "Wolfgang Hasper"
     wrote:
    > > ------------------------------
    > >
    > > Marc,
    > > thanks for your message and the kind invitation.
    > > I am, however, sufficiently familiar with the use
    > > of the instrument. I will need more practice to
    > > increase speed, but as my reproduction is now
    > > complete and neat I am looking forward to gaining
    > > routine soon :o)
    > >
    > > I would be interested to stay in touch anyway and
    > > to discuss experience!
    > > What is your impression of the practical use at
    > > sea?
    > >
    > > I have prepared forms for the calculations,
    > > following the MHR1 nomenclature and including the
    > > almanac-related and sextant correction
    > > calculations. They are good for five sights in one
    > > A3 sheet and come along with a plotting sheet. If
    > > you are interested I will be happy to send you a
    > > pdf?
    > >
    > > I do lack one detail for my second attempt on the
    > > reproduction:
    > > This time I want to have actual machined grooves
    > > on the base and no work-around. Could you tell me
    > > how many groves there are? My best estimate is 18
    > > groves of 5mm width each...
    > >
    > > Thanks again for your message, I am really happy
    > > to learn there is one more user of such instrument
    > > so relatively close to myself :o)
    > >
    > > Best regards
    > >
    > > Wolfgang
    > >
    > > Am Sonntag, 20. Januar 2013 20:08 schrieb Marc
    Giordan:
    > > > Sir,
    > > > I am French and also quite familiar with the use
    > > > of the MHR 1 at sea (I used it for 2 atlantic
    > > > crossings by sail) Would any one wish to be
    > > > trained in using it, I am ready to help ! The
    > > > MHR 1 was bought by my father some 30 years ago
    > > > at the flee market in Paris Yours
    > > > Marc Giordan
    > > > 26 rue de Paris
    > > > 78560 le Port Marly
    > > > (0033)675210703
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    > > > View and reply to this message:
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    > >
    > >  View and reply to this message:
    > > http://fer3.com/arc/m2.aspx?i=122135
    >
    > View and reply to this message:
    > http://fer3.com/arc/m2.aspx?i=122137
    
    
    
    

       
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