. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . k= 1 1 A 5t/<noar^G-Ase J K Car e. —f — ) —t Fig. 80. — Connection for Calibrating Car Gages. and after compression; and (4) actual losses of air, both byleakage and in the air-lift, which was used for circulatingthe cooling water. These losses all affect the efficiency of thesystem, and for the purposes of this test they were separatedas far as practicable. Methods Employed for Determining Efficiency. — In order to secure the necessary datafor determining the motor efficien
. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . k= 1 1 A 5t/<noar^G-Ase J K Car e. —f — ) —t Fig. 80. — Connection for Calibrating Car Gages. and after compression; and (4) actual losses of air, both byleakage and in the air-lift, which was used for circulatingthe cooling water. These losses all affect the efficiency of thesystem, and for the purposes of this test they were separatedas far as practicable. Methods Employed for Determining Efficiency. — In order to secure the necessary datafor determining the motor efficiency at various loads, measure-ments of the resistance of the series and shunt fields were made COMPRESSOR STATION TESTS 269 at working temperatures. The motor was then operated with-out load at normal speed by exciting the field to full-loadstrength by means of current sent through the series field, theconnections for this test being as shown in Fig. 81. Measure-ments of the electrical power input with the motor operatingunder these conditions, give a means for ascertaining the core TROLLEY. WATTHOUR Meter, CROUNO GROUNDFig. 81. — Connection for Electrical Measurements of Motor Losses. losses and friction, which for the purposes of this test may beconsidered constant as the load varies, assuming the speed toremain the same. Compressor Efficiency. — The mechanical efficiency of thecompressor was determined by removing the air valves andrunning it light, the electrical input of the motor beingdetermined at the same time. 270 ELECTRIC RAILWAY TEST COMMISSION Heat Losses from the Air. — In order to ascertain themanner in which the heat energy was hberated from the airduring and after compression, the system was divided up intoa number of sections, and the temperature of the air was mea-sured as it entered and as it left each section. In addition,the amount of water circulated about the cylinders and theintercooler, and the temperatures of the same were carefullydeter
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