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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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