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On Wed, 20 Jan 2010 06:08:28 -0700, Hein Bodahl  wrote:

> How about protecting the scales with a PVC shrink wrap tube ?
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200255742807

That sounds better than the stick on clear protective film I used for book
covers.

> A while back Martin Tali posted PostScript files for the scales, it
> seems to me that using those would be the easiest way to handle the
> scaling problem of different diameter tubing.

Yes indeed.

> I have been thinking about using a 50 or 75mm drain pipe and fixed
> scales.
> Around that I would shrink wrap a movable cursor for the cos scale. This
> transparent wrap, lined to avoid undue friction, would also cover the
> cotan scale.
> Around the wrap covering the cotan scale I would wrap a second, movable
> cursor for the cotan scale. This second cursor would then move in
> conjunction with the cursor for the cos scale, once set, avoiding the
> locking problem.

Interesting solution.  Sort of like a circular slide rule with the two
plastic arms and the cursor drawn on each (instead of two disks and one
cursor); but you could avoid the problem of finding the right segment of
spiral by using a blunt arrowhead instead of a line.  I would miss being
able to see both figures at the same time as a last check, perhaps.

> This would also provide a cylinder to store the necessary tables.

Yes, and the manual.  :-)


--
Richard . . .


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