Date: 1874
The St. Mark's Church, Mauch Chunk.  coal-breaker is of course operated by steam, the capacity of the engines varying from ten to twenty horse-power, and they are constructed on the same plan as those used at the slopes.  As the coal falls from the screens, boys are stationed in the shutes to pick out the slate and impure coal, and it is truly astonishing to observe with what activity they will discover and seize the proscribed intruders.