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Thank you for the great responses!  I'll throw a few more questions out
there since the list has been so helpful.

-I've seen museums use round belts that look like plastic string.  I can see
an obvious advantage of using this belt to provide a reliable slip clutch
for overzealous visitors.  Any thoughts on this?

-And speaking of slip clutches, do you usually recommend a friction clutch
from McMaster, or is there a better alternative for hand-cranked
applications?

This gives me a great start. Thanks!

-Eric


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Eric Yuan
Exhibit Developer
Children's Museum of Portsmouth
280 Marcy Street
Portsmouth, NH 03801
(603) 436-3853
www.childrens-museum.org
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