Hey everyone, I have a question, about singing wine glasses that I just can't seem to find the answer too while searching through different web-pages that google gave me. I'm doing a year end project for my highschool physics course, and I decided to do mine on these singing wine glasses, and resonance. I'm thinking I will have 12 cups (1 octave) and tune them using this note/frequency chart I have, and then explain how more or less water effects the changing pitch, then end with a little demostration of a song. My problem/question is how exactly would I be able to tune the cups? I know I can just add/remove water and tune by ear, but I am looking for a certain equation (if there is one) to find how much water I need in the glass to preduce a certain pitch. Any suggestions, short tutorial and advice is much appreciate as I am currently stuck with a few weeks left. An example of how to tune to, say, D#1 which frequency is 38.9hz would help alot so I can see the steps... :) Thanks Alot!