. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . leeding cock D. By manipula-tion of these valves, any desired pressure up to the limit of thestation, could be obtained in the tank. Ten extra car gages weretaken to the station, and as each car pulled up, its gage wasquickly removed and temporarily replaced with another. Eachgage was then compared with the standard at such pressure ascorresponded to the readings which were taken during the 268 ELECTRIC RAILWAY TEST COMMISSION twenty-four-hour run. Since a record of each car throughoutthis
. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . leeding cock D. By manipula-tion of these valves, any desired pressure up to the limit of thestation, could be obtained in the tank. Ten extra car gages weretaken to the station, and as each car pulled up, its gage wasquickly removed and temporarily replaced with another. Eachgage was then compared with the standard at such pressure ascorresponded to the readings which were taken during the 268 ELECTRIC RAILWAY TEST COMMISSION twenty-four-hour run. Since a record of each car throughoutthis time had been accurately kept, it was a simple matter toenter the corrected readings without the laborious task ofplotting cahbration curves. The results of the calibrationshowed that enough gages were in error to have materiallyaffected the results, had not this precaution been observed. Determination of losses occurring in the system may be classified as fol-lows: (1) motor losses, both electrical and mechanical; (2) com-pressor losses, mechanical; (3) heat losses to the air both during. Fig. 80. — Connection for Calibfating Cat- 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 Efficip:ncy. — 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 condi
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