. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . O! V uo G1—1 83 1S 1^ o o *- m .22 o a No. of Instrument. Fig. 86. —Log Sheet Headings, Tests Nos. 24 and 25. It was found impracticable to put all of the data resultingfrom Tests Nos. 24 and 25 into graphical form, but the mate-rial has been put into tables, and such deductions have beenmade as will be found most useful. For the purpose of illus-tration and to indicate the manner in which the variables arerelated, the results of a single trip have been put into graphicalform in Fig. 87
. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . O! V uo G1—1 83 1S 1^ o o *- m .22 o a No. of Instrument. Fig. 86. —Log Sheet Headings, Tests Nos. 24 and 25. It was found impracticable to put all of the data resultingfrom Tests Nos. 24 and 25 into graphical form, but the mate-rial has been put into tables, and such deductions have beenmade as will be found most useful. For the purpose of illus-tration and to indicate the manner in which the variables arerelated, the results of a single trip have been put into graphicalform in Fig. 87. The results of this part of the test have beenarranged upon a distance base. In this connection it is inter-esting to note that the same run has been illustrated on a timebase in the service tests on tins car, which will be found inChapter II, Part II. Electrical Measurements. In working up the electrical readings for the purpose ofdetermining the total amount of electrical energy used percompressor run, the two sources of information were both Feet 0 310 ELECTRIC RAILWAY TEST COMMISSION From the average current and volts and time, the total energywas determined, and the readings of the watt-hour meter werecompared with the amount of energy thus derived. In obtain-ing the average current, some difficulty was experienced in de-ciding upon the duration of the sudden impulse in the currentat the start. While almost instantaneous, this starting im-pulse was between two and three times the normal value ofthe current. A reasonable assumption for the duration of thestarting current was made, and a satisfactory determination ofthe total energy was obtained by comparing the data calculatedfrom the readings of pressure, current, and time with the read-ings of energy as shown by the watt-hour meter. Air Volume Measurements. The volume of air delivered to the storage reservoir by thecompressor during each run was determined from the differ-ence in pressure before and after the
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