Abstract
A duplicate water-supply system has been recently constructed by the City of Toronto, Canada and, in connection therewith, an extensive pumping station was built at Victoria Park. This station contains eleven centrifugal pumps, driven by induction and synchronous motors, the capacities of the pumps ranging from 6,000,000 gal per day to 60,000,000 gal per day, and the heads ranging from 54 ft to 270 ft. All of the pumps are guaranteed for very high over-all efficiencies, some of them to over 86 per cent, and the penalties for failure to meet the guarantees are very high. The tests on them, therefore, had to be made with unusual accuracy. The paper describes the methods adopted and the photographic recording of the observations, together with results of some of the tests.
