Check out this link about water drop collisions. There is a link to Apex Industrial Supply in San Diego, Ca. They will sell you a Shako Valve. I got mine yesterday. I bought the 1/8 24vdc model, and the 1/4 24vdc model but it was back ordered. Ask for Jose when you get through to sales.
The author of the article has done extensive research on water drop photography and has prepared a nice article. It is a good read for all people interested in the art of water drops.
Here is the link:
http://www.scantips.com/drops/shako/
Now if I could just get mey program to compile I would be in business.
RWW