[Kimmers]

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/soubar.html

Thank you I really enjoyed those pics

[Blueflag]

To 'waste' more time for you at the office, go to this site and click on the pix linked at the bottom ;-)

http://www.galleryoffluidmechanics.com/conden/pg_sing.htm