. Philadelphia and its environs, and the railroad scenery of Pennsylvania . all cars, hauled by mules to the foot of the slope, and then, by means of a wire rope and a stationary engine, dragged up to daylight. When all the coal in the - ^^ territory belonging to the colliery is exhausted, so far as it can be reached from these gangways, the slope is driven downwards another hundred yards,— termed in mining parlance a lift,—and the process is repeated. In the above case, the slope must have been two lifts deep, a not uncommon depth, as they are frequently sunk four, five, and even six lifts. W
. Philadelphia and its environs, and the railroad scenery of Pennsylvania . all cars, hauled by mules to the foot of the slope, and then, by means of a wire rope and a stationary engine, dragged up to daylight. When all the coal in the - ^^ territory belonging to the colliery is exhausted, so far as it can be reached from these gangways, the slope is driven downwards another hundred yards,— termed in mining parlance a lift,—and the process is repeated. In the above case, the slope must have been two lifts deep, a not uncommon depth, as they are frequently sunk four, five, and even six lifts. We give another illustration showing the method of mining by drift. This is possible when the coal lies in a hill and can be reached by following the vein from a point in the valley, so as to have a breast, or workable amount, of coal above the level of the entrance. Here the gangway is con-tinued out to daylight, as shown in the cut. The uncouth building in the same view is a coal breaker, a very useful institution, though built with slight ^i^-^^ in the open MOUNT PISG\H PLANE.
Size: 1430px × 1747px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublisherphiladelphiajblipp
