Date: Mon, 03 Jun 2002 18:08:38 -0400

Author: Dick Heckathorn

Subject: RE: Embroidery Hoop Demo



A ready source of drum heads that are very easy to come by is from a
business that rents drums. The one near me changes drum heads after each
rental. They throw away the used ones.


"Science is nothing more than learning how to communicate with nature in
such a manner that it will talk back."

Helping teachers who facilitate, motivating students who learn.
Dick Heckathorn 14665 Pawnee Trail Middleburg Hts, OH 44130
Physics Teacher CVCA 4687 Wyoga Rd Cuyahoga Falls, OH 44224
330-929-0575 VM 120

-----Original Message-----
[] On Behalf Of Tom Ford
Sent: Monday, June 03, 2002 8:29 AM
Subject: Re: Embroidery Hoop Demo

The only thing to add to all the good responses you have triggered is:

Be VERY quick about hitting it from the inside and it will always work.

You are, of course, only using the INNER hoop of the two part set.
Seran Wrap on the whole thing lets you model the ear drum or vibrational
modes of a drum head under strobe. I find the larger wood hoops best for
all these uses. When the chalk falls from a greater height and still
the coke bottle (or the lab stand bench socket) it is all the more

Tom Ford

At 11:36 AM 6/2/02 -0400, you wrote:
>I am trying to do the embroidery hoop inertia demo.
>I have bought a metal embroidery hoop -- the largest metal one I could
>find at Ames. It is 20 cm in diameter.
>I can easily balance it on a soda bottle, but I cannot balance
>a pen or a pencil or a straw on the top of the hoop.
>What should I do?
>My wife says that largest hoops are available at sewing stores. Is that
>what I need?
>How about a wooden hoop? Do they work better?