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This is true of a recent invention known as "Banner's ventilating cowl," which so long as the wind blows is a most effective device. When the air is perfectly still, however, it offers by its curved air-way a certain resistance to the current, and in the case of baffling winds and flaws the air may blow directly into its opening.
He started down the air-way on his journey to the outer world, bearing his burden as tenderly as a mother would have borne her babe, looking down at times into the still face, letting the tears drop now and then on the paper pinned to the boy's breast. He stopped to rest after a little, holding the child on his knees as he sat, and looking curiously at the letter, on which his tears had fallen.
He started rapidly down the heading, but before he had gone half-way to the head of the plane, the smoke and the foul air were so dense and deadly that he had to stop and to crawl away from it on his hands and knees. He was greatly exhausted when he reached the air-way door again, and he sat on the bench for a long time to rest and to recover.
He held his lamp high and looked out over the black surface of the water. Not far away the roof came down to meet it. A dreadful apprehension entered the man's mind. Perhaps Ralph had wandered unconsciously into this black pool and been drowned. But that was too terrible; he would not allow himself to think of it. He turned away, went back up the chamber, and crossed over again to the air-way.
At last he came to a place where there had been a fall. They had robbed the pillars till they had become too weak to support the roof, and it had tumbled in. Ralph turned back a little, crossed the air-way and went up into the chambers, thinking to get around the area of the fall. He went a long way up before he found an unblocked opening.
He learned also how, by the very rigid laws of air-way, enforced now by all nations under very heavy penalties, the danger of collisions was practically abolished; and so forth. The canon talked fluently and well; but the mass of new information was so great, and the interest of watching so intense, that the enquirer's attention wandered a good deal.
Where the 'tailing up' of the carbonic oxide flame is objectionable, there is no practical difficulty whatever in constructing these burners as a ring, with an air supply in the center, which greatly reduces the length of the 'tail. In practice it is a decided advantage to have a center air-way in all burners of more than about 2 in. diameter, as it enables the injecting tube to be slightly shortened, and lessens the liability of the green film to lift with varying qualities of gas.
I have forgotten to say that water was running down the air-way like a little mill-stream, though it was barely over shoe-tops. We scrambled on with the deadly gas following us, sucked and drawn along by the draught of air. I was last but one and was saved many of the bruises and excoriations which befell the leader.
He rose and went slowly along the heading, over his accustomed route, until he reached a bench by a door that opened into the air-way. Here he sat down again. He was tired and was breathing heavily. A little exertion seemed to exhaust him so. He could not quite understand it.
For it seemed as if some vast invisible air-way had been flung straight from the midst of London, down away to the south-west horizon, where it ran into the faint summer haze thirty miles away.
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