After running the test we were able to conclude that the 8mm diameter hole is too big to create the siphon at the slowest rate on the OPEnS Calibrator. 6mm diameter hole works just fine but takes a little more time than what we want it to. We are going to try a 7mm diameter hole and see how it performs. If this does not work, we will move to other designs. Here are links to the other designs we will try:
We will replicate design B. Designs A & C are similar to what we have already.
http://makezine.com/projects/make-35/ctesibius-and-the-tantalus-cup/