On 3/3/06, Danny Sauer wrote: > So, how does one maintain a coherent, relatively small stream? I'm > specifically thinking about those water "sculpture" things that you > see at theme parks and other outdoor venues, where there are various > combinations of synchronized streams of water at various times. Do > they rifle the nozzle to keep the stream together, or it entirely > based on matching the pressure to the orifice size? Maybe something > to do with the length of the orifice? Apparently (at least on some of the fountain type devices I have looked out) keeping air out of the stream seems to greatly help in holding it together. To this aim I have seen devices that rather than pump directly out the spout pump into a surge tank (or something like it) and then have the outlet to the spout come under the 'air' line. I presume this would also lessen the variations in pressure that could contribute to the stream breaking up. At least the jets I was looking at seemed to all have nice smooth nozzles.. Antony. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist