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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.

gl
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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