Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources.

Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA.

The University of Iowa Disclaimers:  U of Iowa Disclaimer All Rights Reserved..

Another version of this experiment replaces the wine glasses with eggs in egg cups.  Practice or you may end up with " egg on your face"!

Another version is to replace the wine glasses with loops of paper with a 4 inch diameter and a couple of knives that can be clamped to a table.  Clamp the knives edge up.  Then place the loops over the blades and place the dowel in the loops.  The loops will remain intact when the dowel is broken.