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For a view of the originally posted linear expansion device see:
http://www.ph.utexas.edu/~phy-demo/demo-txt/4a30-xx.html It has no
specific PIRA number (hence the xx notation) since it is rarely owned
by many universities.
The device described by Sam Sampere is more common. It is PIRA #
4A30.30
break the bolt. This demonstration is one of the top 500 lecture
demonstrations (as opposed to 4A30.10 bimetal strip and 4A30.20 ball
and ring which are top 200 lecture demonstrations in the category "Solid
Expansion" (PIRA #4A30.xx)
4A30.30 is described in several demonstration manuals: (H-17 in
Sutton,
Ha-10 in Frier and Anderson, Disc 14-10 of the Video Encyclopedia of
Demonstrations). The Physics Demonstration Bibliography is the source
of
this information. AAPT promises to attempt to have it available for
purchase around January, 1999. It has been in preparation for over
10
years by Physics Instructional Resource Association members (An
Affiliate
Society of AAPT).
PIRA is online at: http://cavern.uark.edu/depts/pira/
Other useful resources may be located via the UTEXAS Lecture Demo
Homepage
(Andrew Yue) at: http://storm.ph.utexas.edu/~phy-demo/
There you will find "Demonstration Resources at Other Universities" (a
list
compiled by Keith Warren of NCState at the location:
http://www.ph.utexas.edu/~demog/resources.html
Enjoy, Karl
On Thu, 08 Oct 1998 22:55:52 -0400 Sam Sampereinto
<sampere@suhep.phy.syr.edu> writes:
Why not Herb. Can't you build it and transform the angle change
rod.a linear displacement?? My version uses gas flames to heat a steel
The rod expands and busts an iron bar. No measurements here, justproof
of themal expansion. Loud and dramatic.Physics
This sounds GREAT!!!
Why don't you write it up (with photos) for publication in The
Teacher?the
Meanwhile please let me have further details on the set up. How are
bars anchored and clamped?<ebert@citrus.ucr.edu>
Herb Gottlieb
herbgottlieb@ juno.com FAX 718 224 4764
Herbert H Gottlieb wrote:
On Thu, 08 Oct 1998 23:54:39 -0700 Ron Ebert
Thewrites:the coefficient of expansion. It shouldn't be hard to adapt it as a
We have a lecture demonstration which qualitatively demonstrates
lab where the students can carry out quantitative measurements. It
consists of a long aluminum rod fixed at one end with a bench clamp.
otherneedle
end rests on a wood block, but between the rod and the block is a
setWhen
the edge of the table, and affixed to it is a large paper arrow.perpendicular to the rod. The end of the needle extends out past
the aluminumvisibility
rod is heated with a burner, the arrow will rotate noticeably.Ron...
This sounds like an easy to prepare demo with excellent
thefor large lecture halls. I'm going to show it at the next meeting of
the
New York City Physics Teachers .... and giving you full credit for
thissuggestion. However it seems to demonstrate that an aluminum rodwill lengthen as it is heated. As you say...it is not easy to use
Octoberapparatus for determining the coefficient of linear expansion.physics teachers' meeting at New York University on Friday evening,
Herb Gottlieb from New York City
(Where we invite you to see Ron's expansion demo at our next
23.)
Dr. Karl I. Trappe Desk Phone: (512)
471-4152
Physics Dept, Mail Stop C-1600 Demo Office: (512)
471-5411
The University of Texas at Austin Home Phone: (512)
264-1616
Austin, Texas 78712-1081