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My apologies for going off topic.
I renamed my answer from "[NavList] Re: Cylindrical Slide Rule tube poll"

I have read the posting earlier and the version you describe is of
course the inspiration for my idea. However it seems to me that the
described version still would suffer from the problem of locking the
scales while resetting the cursor. Mine would on the other hand, not be
collapsible.

Also, using shrink wrap tubes would eliminate the problem of "snagging"
along the seems.
The cursors printed on transparency sheets, laminated for stiffness.
Properly cut and shrink wrapped around the tube I believe that it could
make a better transparent outer tube than the adhesive pouch solution.
Accurate cutting could possibly ensure proper friction.

The simple beauty and extraordinary easy production and storage of your
flat Bygrave is unfortunately slightly inhibiting of actual prototyping :-)

Hein

On 21.01.2010 13:01, Gary LaPook wrote:
> See:
>
> http://www.fer3.com/arc/m2.aspx?i=108949&y=200907
>
> gl

> Hein Bodahl wrote:

>> 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.

   

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