NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Dennert & Pape MHR-1 Dennert & Pape MHR-1
From: Wolfgang Hasper
Date: 2013 Jan 30, 20:50 +0100
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 > > > ------------------------------------------------ > > >---- ------------ NavList message boards and > > > member settings: www.fer3.com/NavList Members > > > may optionally receive posts by email. To cancel > > > email delivery, send a message to > > > NoMail[at]fer3.com > > > ------------------------------------------------ > > >---- ------------ > > > > > > > > > > > > > > > : > > > http://fer3.com/arc/m2.aspx?i=122013 > > > > : > > http://fer3.com/arc/m2.aspx?i=122135 > > : > http://fer3.com/arc/m2.aspx?i=122137