With a larger power and higher steam-pressure the efficiency here is slightly greater. TABLE XXI. Two 100-KILOWATT CONTINUOUS-CURRENT TURBO-DYNAMOS FOR WEST BROMWICH ELECTRIC LIGHTING STATION, MADE BY MESSRS. C. A. PARSONS And Co. In January, 1901, a series of trials were made by Professor Ewing of a 500-kilowatt steam turbo-alternator at the works of the Cambridge Electric Supply Co. The machine was constructed by Messrs. C. A. Parsons and Co., and erected at the Cambridge Electric Co.'s station in January, 1900, and ran at times daily, and at times intermittently, according to requirements, up to the time it was tested. The turbine is of the parallel-flow type, with its shaft as usual directly coupled to the armature of the alternator, which is of the four-pole type, and designed to give 250 ampères at 2000 volts, running at 2700 revolutions a minute. The turbine is governed electrically, and is furnished with a surface condenser, and drives its own air-pump and circulating pump by means of a shaft carrying a screw-wheel driven by a worm on the main turbine shaft. Pablo XXII shows the collected results of the trials, and Figs. 162 and 163 show the steam consumption graphically. The straightness of the line in Fig. 163 will be noticed. TABLE XXII. TESTS OF 500-KILOWATT PARSONS TURBO-ALTERNATOR AT CAMBRIDGE. Electrical Output in Kilowatts. FIG. 162.-Steam Consumption of 500-Kilowatt Parsons Turbo-alternator at Cambridge. FIG. 163. Steam Consumption of 500-Kilowatt Parsons Turbo-alternator at Cambridge. Table XXIII. supplies particulars of the pressures, tempera tures, speeds, etc. TABLE XXIII. TESTS OF 500-KILOWATT PARSONS TURBO-ALTERNATOR AT CAMBRIDGE. In January, 1900, tests were made at the works of Messrs. C. A. Parsons and Co., Newcastle-on-Tyne, of a 1250-kilowatt |