http://www3.telus.net/ereiswig/

Eric Reiswig's Homepage
"Coppers and Brass"
Or,
Making Something out of Nothing

http://home.att.net/~bobbeecher/trombone/trombone.html

trumpet valves.
http://www.usd.edu/smm/UtleyPages/Utleyfaq/brassfaq.html