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    Cylindrical Slide Rule / tube lengths
    From: Wolfgang Hasper
    Date: 2010 Jan 27, 21:37 +0100

    I received a sample of those laminated paper tubes.
    The exterior surface is very smooth and even, rather
    matte than glossy. I am sure it can be used to put on
    printed scales without further treatment.
    By the way: I found white adhesive film in A4 size that
    can be used in a laser printer.
    the interior surface is glossy, due to production on a
    core tube. (it is a coiling production process. No
    noticeable seam or other irregularity from the coil
    end on the outside though.)
    For ease of transport and to save on cost there the
    tubes should be cut to length at the manufacturer's.
    They provide precise cuts to right-angles which I think
    is a huge benefit and valuable help for our futher
    work. I will shortly receive information on the
    cutting cost.
    As I find only now those lengths are not sufficiently
    known yet. RvR's paper gives account of the visible:
    inner tube		something > 230mm with 198 mm of scale
    intermediate tube	225 mm
    outer/cursor tube	222 mm (this is reliably the true
    length of the tube)
    The intermediate tube will for sure extend into the
    base and end just before the "upper" cursor cut-out
    (marked II). (assumed cursor tube on zero stop) So the
    inner tube is visible there.
    The inner tube itself will be long enough to be
    sufficiently  stabilised when fully drawn out, yet
    short enough to leave some space for the locking
    mechanism down in the base region (when slide rule is
    fully closed)
    Assume the black base is a "cup" slipped on the end of
    the intermediate tube.
    I will make a sectional drawing to determine the
    missing lengths and post it for discussion. Any
    comments welcome.
    Would you please tell me if anybody wants to have
    non-HR lengths?

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