. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . it is necessary to maintain dump-gangs, as is usually the case,these cars can be dumped by that labor about as quickly as the 80 STEAM SHOVEL MINING. MECHANICAL EQUIPMENT 81 air-dumped type; furthermore it is often necessary to respotthe train to dump the material where desired and in such casesthere is no advantage in being able to dump all cars simul-taneously. Under such usual conditions it will be found thatthis car, being of simpler construction, will stay in service longer
. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . it is necessary to maintain dump-gangs, as is usually the case,these cars can be dumped by that labor about as quickly as the 80 STEAM SHOVEL MINING. MECHANICAL EQUIPMENT 81 air-dumped type; furthermore it is often necessary to respotthe train to dump the material where desired and in such casesthere is no advantage in being able to dump all cars simul-taneously. Under such usual conditions it will be found thatthis car, being of simpler construction, will stay in service longer,require fewer repairs and be more economical to operate thanthose dumping by air. The company using this car has mademany changes in the size of dump cars since operations werestarted. The first cars used were 6-cu. yd. two-way dump-cars,next came 12-cu. yd. cars with one-way dump, these were dis-carded for 18-cu. yd. cars and now the 20-cu. j^d. car is factors governing the size of the cars are the height of centreof gravity, the amount of dead weight per cubic yard capacity andthe number of cubic yards which can be hauled per trip. Amongthe builders of both types may be mentioned the Kilbourne &Jacobs Manufacturing Co., Columbus, Ohio; Ol
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