The Vaughan was worked by a single shaft divided by a strong wooden partition into two, one of these known as the downcast shaft, that is, the shaft through which the air descends into the mine, the other the upcast, through which the current, having made its way through all the windings and turnings of the roadways below, again ascends to the surface. This system of working by a single shaft, however, is very dangerous, as, in the event of an explosion, both shafts may become involved in the disaster and there will be no means of getting at the imprisoned miners. Nowadays all well-regulated mines have two shafts, one at a distance from the other, but this was less common thirty years back, and the Vaughan, like most of its neighbours, was worked with a single shaft.
Each miner before descending went to the lamp-room and received a lighted "Davy." As almost every one is aware, the principle of this lamp, and indeed of all that have since been invented, is that flame will not pass through a close wire-gauze. The lamp is surrounded with this gauze, and although, should the air be filled with gas to an explosive point, it will ignite if it comes in contact with flame, the gauze prevents the light of the lamp from exploding the gas-charged air outside. When the air is of a very explosive character even the Davy-lamps have to be extinguished, as the heat caused by the frequent ignitions within the lamp raises the gauze to a red heat, and the gas beyond will take fire.
Jack took his place in the cage with Bill Haden and as many others as it could contain. He gave a little start as he felt a sudden sinking; the sides of the shaft seemed to shoot up all round him, wet, shining, and black. A few seconds and the light of day had vanished, and they were in darkness, save that overhead was a square blue patch of sky every moment diminishing in size.
"Be'st afeard, Jack?" Bill Haden asked, raising his lamp so as to get a sight of the boy's face.
"Noa, why should I?" Jack said; "I heard 'ee say that the ropes were new last month, so there ain't nothin to be afeard on!"
"That is the young un they call Bull-dog, ain't it, Bill?"
"Ay!" Bill Haden answered; "he's game, he is; you can't make him yelp. I've licked him till I was tired, but he never whimpered. Now then, out you go;" and as the cage stopped the men all stepped out and started for the places in which they were working.
"Coom along, Jack; the viewer told me to put you at No. 10 gate."
It was ten minutes fast—and as Jack thought very unpleasant—walking. The sleepers on which the rails for the corves, or little waggons, were laid, were very slippery. Pools of water stood between them and often covered them, and blocks of coal of all sizes, which had shaken from the corves, lay in the road. When it was not water it was black mud. Sometimes a line of waggons full or empty stood on the rails, and to pass these they had to squeeze against the damp walls. Before he reached his post the gloss of Jack's new mining clothes had departed for ever. The white jumper was covered with black smears, and two or three falls on the slippery wooden sleepers had effectively blackened his canvas trousers.