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The successful application of the pneumatic system at the Mont Cenis Tunnel in Italy, and at the Hoosac Tunnel in America, has demonstrated the value of the system where the air not only served to transmit power to operate the machinery but to ventilate the mines at the same time. Air brakes for railway trains are another example illustrating the advantages of pneumatic transmission; the force being multiplied at the points where it is applied, so that the connecting pipes are reduced to a small size, the velocity of the air making up for a great force that formerly had to be communicated through rods, chains, or shafts. The principal object attained by the use of air to operate railway brakes is, however, to maintain a connection throughout a train by means of flexible pipes that accommodate themselves to the varying distance between the carriages. Presuming that the flow of air in pipes is not materially impeded by friction or angles, and that there will be no difficulty in maintaining lubrication for pistons or other inaccessible parts of machinery when driven by air, there seems to be many reasons in favour of its use as a means of distributing power in manufacturing districts. The diminished cost of motive power when [56] it is generated on a large scale, and the expense and danger of maintaining an independent steam power for each separate establishment where power is employed, especially in cities, are strong reasons in favour of generating and distributing power by compressed air, through pipes, as gas and water are now supplied. IV. THE END “I always said whether you fly a crate full of passengers or handle one full of eggs, you get a good break sometimes!” Stone considered his dignity as a representative of the press, and decided that he would not be treated with levity. He would resent the attitude of the soldiery; but in his resentment he passed the bounds of courtesy altogether, forgetting whose toddy he had just drunk, and beneath whose tent pole he was seated. He said rude things about the military,—that it was pampered and inefficient and gold laced, and that it thought its mission upon earth fulfilled when it sat back and drew princely pay. "How did I know it? How does any man know that another is drunk? He was boisterous, excited and yelling—that kind of a drunk." "Because I've thought of something much grander, surelye. I'm going to m?ake us all gurt people, and this a gurt farm. But you've got to help me, you and Harry." "Oh, no," said Reuben, sitting in yesterday's chair, and gazing up at the Rossetti. Chapter 25 "I wonder how much she m?akes at it." HoME 免费一级刺激喷吹A片 ENTER NUMBET 0018www.51amiba.com.cn
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