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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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