PUMPING ENGINES AT BOSTON AND CHICAGO,
马萨诸塞州波士顿大都会水厂系统栗子山高级服务站的3000万加仑发动机是由威斯康星州密尔沃基市的Allis-Chalmers Company设计和建造的。包含类型，有三个单链反应的外部装满的柱塞，以合同速度（约17秒和一半的旋转速度）在二十四个小时内提供了30,000,000美国GALS的容量。该合同规定，该合同应履行150,000,000英尺磅的职责。每1,000磅。发动机和辅助泵使用的商业干燥蒸汽，含有不少于100％的水的蒸汽，通过量热计测量确定的是基于柱塞 - 置换量的蒸汽，每1,000,000，000,000美元的奖励为1,000美元英尺。每1,000,000英尺磅的没收2,000美元。或低于保证的分数，这是合同出租时指定的最高分数。该发动机的官方测试显示1715,497,000英尺。每1000磅。干蒸汽，包括所有辅助设备使用的蒸汽，总升力为140英尺，蒸汽的压力为185磅。 The following are statistics relating to the operation of the engine, showing the economy maintained from 1901 to 1904, each inclusive:
1900.—Total quantity pumped (1,000,000 gallons), 8,923.39; total coal used (lbs.), 5,627,514; gallons pumped per lb. of coal,--T,473.72; average head pumped against (ft.), 125.34. Cost of fuel, average per ton. 2,240 lbs., $4: cost per 1.000,000 gals, pumped to reservoir, including labor, repairs and renewals to engine, boilers and piping, oil, waste, packing and small supplies, $2,832; cost per 1,000,000 gals, raised one ft. high, including some items, $0,023.
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