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The fountain has an axial thrust of 103,000 pounds-force (460 kN); water is jetted out of the 6-foot (1.8 m)-tall aerated nozzle at a pressure of 550 pounds per square inch (3.8 MPa). [6] The four smaller fountains use 125-horsepower pumps, and each is fed by water from an 8-acre (3.2 ha), million-gallon (3.8m l) lake in which they sit. [ 7 ]
Later recordings have a number of replacements: Of all versions, Judy Garland's 1961 Judy at Carnegie Hall concert recording contains more references than most: Marshall Field's department store, the Drake Hotel, the Chicago Loop, The Pump Room at the Ambassador East hotel, and even Mrs O'Leary's Cow.
The current pump was installed in 1945, replacing earlier versions that date to the 1930s. [3] [5] As early as 1957, the pump drew press attention for its popularity. [5]A 1950s Forest Preserve superintendent noted that the well was so well-used that "when the handle is broken, everyone in the [office] knows about it within an hour". [5]
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A hydraulic ram pump, ram pump, or hydram is a cyclic water pump powered by hydropower. It takes in water at one " hydraulic head " (pressure) and flow rate, and outputs water at a higher hydraulic head and lower flow rate.
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