. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . discharged on either orboth sides, or in the center, according to the different manner ofmanipulating the bottom-plates and side-doors. Dischargingcan be done with safety while running at any speed, and in thisway the material can be spread for a considerable distancefrom the track. Dumping all or any number of the cars isdone by one man in any part of the train. For stripping service,however, these cars are seldom used as they are not sufficientlyrugged and simple. A hand-dumpe
. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . discharged on either orboth sides, or in the center, according to the different manner ofmanipulating the bottom-plates and side-doors. Dischargingcan be done with safety while running at any speed, and in thisway the material can be spread for a considerable distancefrom the track. Dumping all or any number of the cars isdone by one man in any part of the train. For stripping service,however, these cars are seldom used as they are not sufficientlyrugged and simple. A hand-dumped car of 20 cu. j^d. capacity and dumping fromone side only, which has been found to give very satisfactoryservice, is illustrated in Figs. 15 and 16. Desirable features willbe noted in the all-steel construction, extended bottom, one-waydump, wood buffer-sills, steep dumping angle, pivoted door andself-righting balance. The one-way dump adds to its mechanical MECHANICAL EQUIPMENT 79 strength and the steep 47° angle assists in discharging sticky orpartly frozen material. Such cars cost about $2500 each. Where. 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
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1920
