. Electric railway journal . the high and low points are smoothed out but averageconditions are indicated. It is seen from these graphs that, if average condi-tions always obtained, two points of heat would meetmost of the requirements, as the lowest averagetemperature is but 19 deg. Fahr. The heating seasonextends from Nov. 1 to the middle of April. Be-tween Dec. 1 and the first week in March there wouldbe periods when two points of heat are necessary. Similar graphs for the maximum and minimum tem-peratures during the winter months of 1917 are alsoshown. These indicate that there were 168 da
. Electric railway journal . the high and low points are smoothed out but averageconditions are indicated. It is seen from these graphs that, if average condi-tions always obtained, two points of heat would meetmost of the requirements, as the lowest averagetemperature is but 19 deg. Fahr. The heating seasonextends from Nov. 1 to the middle of April. Be-tween Dec. 1 and the first week in March there wouldbe periods when two points of heat are necessary. Similar graphs for the maximum and minimum tem-peratures during the winter months of 1917 are alsoshown. These indicate that there were 168 daysduring the year with temperatures of 40 deg. below. During portions of twenty-four days threepoints of heat were required, two points for portionsof sixty-seven days and but one point for portions ofseventy-seven days. It is also seen that during thethree winter months of December, January andFebruary there were thirty days out of the total of Trolley ThERMOSTAT CONTROLLER CONTACTSCIRCUIT IS CLOSEDWHEN POWER IS ON. CONNECTIONS FOR INTERLOCKING HEATER CONTROLWITH CAR CONTROL ninety on which temperatures above 40 deg. wererecorded, when no heat was required. The full capacityof the heater equipment installed is thus required buta small percentage of the time in this climate. Some tests have been made to determine the prac-ticability of utilizing the heat from the main motorsfor car heating, but the results so far obtained indi-cate that the cost of the necessary air connection tothe motors is high and that the hot air itself mustbe prevented from entering the car due to liabilityof offensive odor. In all-steel car construction thereis a type of floor used with air space to provideheat insulation. The hot air from the motors couldbe led through this space and so aid in heating thefloor without allowing the air to enter the car. TABLE I—COMPARISON OF HEAT PRODUCED BY RESISTORSAND HEATERS IN CARS WITH SAME SERVICE Aver- Aver-age ageOut- In- Aver-side side ageAir, Air, R
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