. Official proceedings . bservation cai-s. The requirements of the 163 several types differ to a certain degree. However, it is not fea-sible, from a manufacturing standpoint, to manufacture a widevariety of types. Careful calculations, backed by operating ex-perience, indicate that a cooling capacity of 6 tons of refrigera-tion (72,000 Btu. per hour) will ibe ample for any normal car inany section of the country. To provide this capacity in a cool-ing system requires approximately 9 kw. in power for continu-ous operation. However, the apparatus seldom operates over60 per cent of the time on t
. Official proceedings . bservation cai-s. The requirements of the 163 several types differ to a certain degree. However, it is not fea-sible, from a manufacturing standpoint, to manufacture a widevariety of types. Careful calculations, backed by operating ex-perience, indicate that a cooling capacity of 6 tons of refrigera-tion (72,000 Btu. per hour) will ibe ample for any normal car inany section of the country. To provide this capacity in a cool-ing system requires approximately 9 kw. in power for continu-ous operation. However, the apparatus seldom operates over60 per cent of the time on the average. In addition, the powerplant must provide for the car lighting and battery sum of these loads necessitates an axle generator of 15 , compared with existing machines of 4 kw. The bat-tery capacity is likewise increased from 300-600 ampere-hourscapacity to 800-1000 ampere hours capacity. To meet theselarger requirements, the battery manufacturers have developeda new light-weig-ht The automatic features of the equipment make supervision simple. The Controls fit standard lighting control cabinets. Power Supply: The power supply for a railway car has always been a prob-lem. The maintenance of car lighting apparatus has been anitem of magnitude. The number and types of generator drives 164 tried and found wanting are legion. The most universally useddrive is the flat belt, but from past experience its capacityseems to be definitely limited to a capacity not exceeding 5 , to provide a drive for a 15 kw. generator required thedevelopment of a radically new drive. The entire air-conditioning development hinged on the de-velopment of a source of power. Xo apparatus could be morereliable than its source of power. For a positive, long-life drive,free from troubles, no form can equal the gear type. Many ob-jections were raised by operators to this type of drive, but mostof the troubles forecast have never occurred. Previously geardrives ha
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