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    Re: Cylindrical Slide Rule / tube lengths
    From: Hanno Ix
    Date: 2010 Jan 31, 10:39 -0800
    Thank you, Wolfgang.
    I can see the first attachment ( very nice!) but the second did not open. Any hint?

    From: Wolfgang Hasper <wolfgang.hasper@web.de>
    To: NavList@fer3.com
    Sent: Sun, January 31, 2010 2:37:45 AM
    Subject: [NavList] Re: Cylindrical Slide Rule / tube lengths

    I did some practical archeological research and
    investigated the (hidden) dimensions of HR/MHR, see
    attached drawing.

    (The .dxf can be opened with any CAD software, if you
    do not have any you can download Q-CAD here for free:

    Based on the dimensions found I ordered the tubes so we
    will not need to care for the lengths later.
    All those who would like to make a Bygrave, however,
    can cut the tubes, the Bygrave is shorter.

    I had an idea on how to make a simple locking
    mechanism, shown in the upper left part of the
    It uses simple materials and can be made with a jigsaw,
    no special parts needed.
    It is based on a number of longitudinal cuts in the end
    of the inner tube, creating a number of segments that
    can be bent outwards by a disc with circular wedges on
    its circumference.
    I will make a sample and see what it is worth.

    Thank you Gary for your plug details, this is really
    good to know!


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