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On 20.01.2010 06:38, Richard M. Pisko wrote:

> I think a felt liner would be almost essential for prolonged use.
> Aluminum tends to blacken surfaces through rubbing.  A coating of the
> paper or plastic would help, and I had even thought of spraying the
> inside of the outer tube with a thin film of drawing fixative; but I
> believe that felt would be the best solution.

How about protecting the scales with a PVC shrink wrap tube ?

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200255742807

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.

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.

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

Perhaps...

Hein

   

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