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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Underground City by Jules Verne: shafts of the Aberfoyle colliery, which in this respect was very well off;
frames furnished with automatic lifts, working in wooden slides,
oscillating ladders, called "man-engines," which, by a simple movement,
permitted the miners to descend without danger.
But all these appliances had been carried away, after the cessation
of the works. In the Yarrow shaft there remained only a long succession
of ladders, separated at every fifty feet by narrow landings.
Thirty of these ladders placed thus end to end led the visitor
down into the lower gallery, a depth of fifteen hundred feet.
This was the only way of communication which existed between
the bottom of the Dochart pit and the open air. As to air,
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