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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:


https://sites.google.com/site/sliderulesite/position-line-slide-rules/PositionLineSlideRules2009.pdf?attredirects=0

gl




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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