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    Re: Cylindrical Slide Rule tube poll
    From: Gary LaPook
    Date: 2010 Jan 22, 13:07 -0800

    The sizes you mentioned are the same as the original HR-1 and the
    original Bygrave is only slightly different, 54, 59 and 64. See:
    Wolfgang Hasper wrote:
    > Since we come back to the tubes time after time
    > I am interested to find out how many would like to make
    > an actual reproduction on reproduced tubes?
    > The HR1 uses Aluminium tubes
    > (all dimensions [mm])
    > inner tube	54x1		235 long
    > interm. tube	58x1		225 long
    > outer tube	62x1		222 long
    > A kit of all three sizes 300 long each would be nice.
    > Narrow tolerances are required for the outer diameters
    > to fit the scales, the inner diameter is less
    > important. If there is a felt lining as on the
    > original you can easily compensate for 0.2 mm.
    > Aluminium as the material seems preferable but not
    > compulsory. I would not like to have stainless steel,
    > it is heavy and a pain to machine.
    > To investigate the local possibilities for custom tubes
    > I have started with a firm that works with perspex.
    > Maybe plastic is more realistic to have in custom
    > dimension than aluminium? We'll see.
    > I will try on aluminium tubes also.
    > If Douglas is successful earlier it will be even
    > better, maybe we can get two independent quotes.
    > How many on the list would be interested in how many
    > kits?
    > If you want I could compile a list of all interested so
    > we know how many metres we will have to order ;o)
    > Wolfgang

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