Though the coal is very sound in the mine, and presents a handsome appearance after it is extracted, it soon crumbles on exposure to the air, and the railroad men do not speak well of it for locomotive use.
This makes a secure covering.  Though the coal is very sound in the mine, and presents a handsome appearance after it is extracted, it soon crumbles on exposure to the air, and the railroad men do not speak well of it for locomotive use.  It crumbles in the fire, and makes clinkers that melt and stick to the bars.