. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . ort test was also made covering a period of one and one-half hours, to determine the fluctuations of the various quantitiesinvolved in the compressing of air by means of the appa-ratus tested. The air compressor was rim a number of timesduring this test, and observations were taken at very frequentintervals during each run. While the results of this test havebeen worked up in considerable detail, it has been found thatthe limitations of the printed report will not permit of theirbeing shown
. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . ort test was also made covering a period of one and one-half hours, to determine the fluctuations of the various quantitiesinvolved in the compressing of air by means of the appa-ratus tested. The air compressor was rim a number of timesduring this test, and observations were taken at very frequentintervals during each run. While the results of this test havebeen worked up in considerable detail, it has been found thatthe limitations of the printed report will not permit of theirbeing shown graphically. The data resulting from this testshow that the power fluctuates from a high value at the startthrough a low value, and increases toward a maximum as theair pressure in the storage tank rises. The total flucti^ation 264 ELECTRIC RAILWAY TEST COMMISSION of the power during a rmi amounts to approximately 25 percent after the pressure in the compressor has risen high enoughto open the valves. Until air actually begins to enter thestorage tank, the consumption of power averages less than 50. GROUND GROUND Fig. 79. ■Electrical Connections for Tests of Compression Stations. per cent of the maximum. Less than one minute is requiredfor this operation. ORIGINAL MEASUREMENTS. The principal original data obtained for the compressorstation tests may be divided into five general classes as follows:(a) those relating to the electrical input; (6) those relating to COMPRESSOR STATION TESTS 265 time; (c) those relating to the speed of the motor-driven com-pressor, and the number of double strokes of the air compressorpiston; (d) those relating to the pressure of air at various pointsin the system; and (e) those relating to the temperatures ofair and water. In addition, tests were made to determine the efficiency ofthe motor-compressor, and many other data were obtained,which either relate to the general conditions existing duringthe tests or which were necessary in the working up
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