Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Dennert & Pape MHR-1 Dennert & Pape MHR-1 HR-2 Cylindrical Slide LineRuler
    From: Brad Morris
    Date: 2013 Jan 27, 18:16 -0500

    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" <wolfgang.hasper{at}web.de> wrote:

    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
    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
    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
    > ----------------------------------------------------
    > View and reply to this message:
    > http://fer3.com/arc/m2.aspx?i=122013

    View and reply to this message: http://fer3.com/arc/m2.aspx?i=122135

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.

    Email Settings

    Posting Code:

    Custom Index

    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site