If a shaft has been sunk and properly supported,—that is to say, timbered or walled,—it is generally divided into compartments. The shafts are generally from fifteen to twenty feet in diameter, and consequently there is plenty of space for dividing them. One of the compartments will serve for the tubs, cages, or buckets, in which the coal is raised. Another is for pumps to draw off the water, and sometimes where the miners go up and down by ladders a compartment is made especially for them.
LEGAL NECESSITIES.
In all cases one compartment in the shaft serves as an air-way or chimney, whether the draft is free or not. In some countries the law requires that there shall be more than one shaft, or opening, to every mine, while in other countries no such law exists. Many of the owners of mines are abandoning the single shaft system, and gradually supplying their mines with more than one entrance. Many terrible accidents, accompanied by a great loss of life, might have been avoided had the mines been constructed with more than one entrance or shaft. A striking example of this is in the terrible calamity at Avondale, a few years ago. The most approved arrangement of shafts for a large mine where there is explosive gas, and where water is to be pumped, is to sink one shaft for the pumps, another for raising coals, and a third for ventilation. At the bottom of the third one a large furnace is always kept burning.
In some of the mines there may be half a dozen shafts. Those through which the coal is drawn are called the winding pits, those where the pumps are fitted are called pumping pits, those where the men go up and down, are called labor shafts, and those for the passage of air are known as air shafts.
In many mining regions there is a class of pits that have been abandoned in consequence of the coal beneath being worked out. Sometimes these pits are made use of for purposes of ventilation. Proper care is not always taken of these abandoned holes, and they form dangerous precipices, through which a careless person may easily fall and be killed. Strangers strolling in the vicinity of mines occasionally step into these shafts and disappear, to be seen no more alive.
IV.
ACCIDENTS IN SHAFTS.
ADVENTURE OF THE AUTHOR DESCENDING A SHAFT.—A MINUTE OF PERIL.—LIFTED THROUGH A SHAFT BY ONE LEG.—A COLLISION IN MID-AIR.—SENSATIONS OF THE DESCENT.—A MINER’S VIEWS OF DANGER.—PICTURESQUE SCENE AT A DESCENT.—OFFERING PRAYERS.—SCENE AT A RUSSIAN MINE.—SAFETY CAGES.—THEIR CONSTRUCTION.—A LUDICROUS INCIDENT.—HOW A MAN FAILED TO KEEP AN ENGAGEMENT.—DOWN IN THE SALT MINES OF POLAND.—A PERILOUS DESCENT.—“PLENTY MORE MEN.”—ACCIDENT NEAR SCRANTON.—“PUTTERS.”—HOW GIRLS WERE USED IN SCOTLAND.—MAN ENGINES.—THE LEVELS.—AN ACCIDENT CAUSED BY RATS.—THRILLING AND FATAL ADVENTURE OF TWO PENNSYLVANIA MINERS.—A FEARFUL FALL OF ROOF.—CARRYING A DYING COMRADE TOWARD THE LIGHT OF DAY.—EIGHT HOURS OF MORTAL AGONY.