here you go, jeffies and wife. the underwater lawn sprinkler as shown by
Feynman (remember him?) on the first hit.

jeffies, people who claim to have a degree in physics should be able to
remember this stuff.

http://groups.google.com/groups?q=%2...an&hl=en&lr=&i
e=UTF-8&selm=4l58m4%24359%40newsbf02.news.aol.com&rnum =1