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    Re: Cylindrical Slide Rule / tube lengths
    From: Gary LaPook
    Date: 2010 Jan 28, 01:52 -0800

    If you want to use the locking device that I came up with and you can't
    buy the components where you are I could purchase them here and ship
    them to you. The plugs cost about five dollars each, you need two of
    them, and I think the threaded rod was about the same. I think it would
    cost about twenty dollars for all the components including postage if
    anybody is interested.
    Wolfgang Hasper wrote:
    > 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?
    > Wolfgang

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