Date: Sun Sep 16 16:05:09 2007

Author: Urs Lauterburg

Subject: Re: Chaotic Pendulum source

Post:
--============_-1022149401==_ma============
Content-Type: text/plain; charset="iso-8859-1" ; format="flowed"
Content-Transfer-Encoding: quoted-printable

Tim,

These pendulums indeed look very nice and the=20
prize seems fair. Dick's suggestion to buy two of=20
them and start them at the same time from the=20
very same position is interesting and the length=20
of the time they stay ''in phase'' cold possibly=20
be taken as a measure for the quality and he=20
precision. Of course you have to start them=20
precisely and this should best be made=20
automatically from an accurately defined=20
position. I predict the higher the initial=20
potential energy the shorter the time until they=20
diverge.

Anyway there is a Swiss technical craftsman=20
school which educates what we call polymechanics=20
(this is a profession) and they also make and=20
sell things for physics education. The have a=20
very nice chaotic pendulum which runs for a very=20
long time. It's the one from Mr. Rott, a=20
polymachanic himself who worked many years at the=20
ETH (Swiss Polytechnical Institute) in Z=FCrich.=20
It's a nice one too but it's a bit more expensive=20
then the one from New Zealand, 195 sFr (165.5 US$=20
+ shipping I suspect) but then again it's=20
genuinely Swiss Made ;-)

http://www.mswshop.ch/mechanik_B15_detail.asp?RECORD_KEY=3Dsku&sku=3D107

Sorry the page is in german but you may have it=20
translated by one of these web translator tools.

Regards and best wishes

Urs

Urs Lauterburg
Physics demonstrator
Physikalisches Institut
University of Bern
Switzerland

PS: One of the greatest hallway displays I have=20
ever seen is the one you made: The setup that=20
shows the longitudinal oscillation modes that=20
result when a line of pendulums of decreasing=20
lengths are released a the same time. The=20
apparatus you have built is just gorgeous. It=20
must be awesome to look at the real thing instead=20
of just the movie which of course is very nice=20
too. Congratulation Physics Instructional=20
Resourcers at Arizona State !


>Hello everyone:
>
>We've recently received some chaotic pendula=20
>that I am very pleased with and I want to pass=20
>on the source to you all. Check out=20
>http://www.chaoticpendulums.com/ .=20
>I found the quality, attention to detail and=20
>performance to be excellent. This company is in=20
>New Zealand but is set up to do business nicely=20
>in the US though Paypal. I was able to use a=20
>university VISA purchasing card to make the=20
>purchase with no problems and without a Paypal=20
>account. This is the 1st source I've found for=20
>quality chaotic pendula. They come with a very=20
>nice wall mounting plate, screws and drywall=20
>inserts for wall mounting, but you can also=20
>mount directly to metal. They also come in a=20
>nice presentation box. Take a look!
>
>Tim
>
>Tim Cook, Team Leader, Physics Instructional Resource Team
>Department Compliance Officer
>Arizona State University, Department of Physics
>PO Box 871504, Bldg. PS Rm F470, Tempe, Arizona 85287-1504
>480-727-8398;fax 480-965-7954;=20
>tim.cook@asu.edu;=20
>http://pirt.asu.edu/
>

--============_-1022149401==_ma============
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable



Tim,

These pendulums indeed look very nice and the prize seems fair. Dick's
suggestion to buy two of them and start them at the same time from the
very same position is interesting and the length of the time they stay
''in phase'' cold possibly be taken as a measure for the quality and
he precision. Of course you have to start them precisely and this
should best be made automatically from an accurately defined position.
I predict the higher the initial potential energy the shorter the time
until they diverge.

Anyway there is a Swiss technical craftsman school which educates what
we call polymechanics (this is a profession) and they also make and
sell things for physics education. The have a very nice chaotic
pendulum which runs for a very long time. It's the one from Mr. Rott,
a polymachanic himself who worked many years at the ETH (Swiss
Polytechnical Institute) in Z=FCrich. It's a nice one too but it's a
bit more expensive then the one from New Zealand, 195 sFr (165.5 US$ +
shipping I suspect) but then again it's genuinely Swiss Made ;-)

http://www.mswshop.ch/mechanik_B15_detail.asp?RECORD_KEY=3Dsku&sku=3D107

Sorry the page is in german but you may have it translated by one of
these web translator tools.

Regards and best wishes

Urs

Urs Lauterburg
Physics demonstrator
Physikalisches Institut
University of Bern
Switzerland

PS: One of the greatest hallway displays I have ever seen is the
one you made: The setup that shows the longitudinal oscillation modes
that result when a line of pendulums of decreasing lengths are
released a the same time. The apparatus you have built is just
gorgeous. It must be awesome to look at the real thing instead of just
the movie which of course is very nice too. Congratulation Physics
Instructional Resourcers at Arizona State !


Hello
everyone:

We've
recently received some chaotic pendula that I am very pleased with and
I want to pass on the source to you all. Check out http://www.chaoticpendulums.com/ . I found the quality, attention to
detail and performance to be excellent. This company is in New Zealand
but is set up to do business nicely in the US though Paypal. I was
able to use a university VISA purchasing card to make the purchase
with no problems and without a Paypal account. This is the 1st source
I've found for quality chaotic pendula. They come with a very nice
wall mounting plate, screws and drywall inserts for wall mounting, but
you can also mount directly to metal. They also come in a nice
presentation box. Take a look!

Tim

Tim
Cook, Team Leader, Physics Instructional Resource
Team
Department Compliance Officer
Arizona State University, Department of
Physics
PO
Box 871504, Bldg. PS Rm F470, Tempe, Arizona
85287-1504
480-727-8398;fax 480-965-7954; tim.cook@asu.edu; http://pirt.asu.edu/




--============_-1022149401==_ma============--

Back