Posted by buickanddeere on June 30, 2016 at 10:07:53 from (184.151.37.85):
In Reply to: steam/air whistles posted by tulsa zoo on June 30, 2016 at 09:48:13:
Steam whistles operated on air sound way off key due to the difference in the density of steam vs air , the speed of sound in steam vs air and difference in velocity of steam vs air at the same pressure.
Maybe able to tune the note some by varying pressure and the orifice size in the valve/whistle.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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