Rachel Storlie, a professor at Luther College Music Department, plays the Hesper-Mabel Steam Calliope at Nordic Fest in Decorah, Iowa. Harry Shell built this circus wagon in the early 1900s and installed the whistles and valves with a boiler inside the wagon. 32 whistles are chromatically tuned (loosely speaking), starting with C below middle C, and operate at 50 psi of steam pressure. Learn more about this Calliope and find more organ music on Pipedreams.
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