Adam Thompson Model Railroading is fun!
Larry Resident Microferroequinologist (at least at my house) Everyone goes home; Safety begins with you My Opinion. Standard Disclaimers Apply. No Expiration Date Come ride the rails with me! There's one thing about humility - the moment you think you've got it, you've lost it...
QUOTE: Originally posted by ben10ben Here's how I understand it: Steam is admitted to a cupped bowl. Above this bowl is a bell made out of copper or brass, with a slight gap separating the bottom of the bell from the top of the bowl. Steam escaping through this slot sets up a different pressure on the outside of the bell than the inside, and in turn causes the vibration of air molecules which are perceived as sound. The frequency of the vibrations and therefore the pitch of the sound is determined by both the length and the diameter of bell.
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