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The motor passed along swiftly in the darkness. Inside the opera house many people noticed that Countess Lalage's box was only tenanted through the second act of the new opera by a very pretty girl in white, with no ornaments in her hair. Hetty, on the other hand noticed nothing at all but the stage; she had actually forgotten that her employer was not there. The opera was a rare treat to her, and she revelled in music.

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A snarling curse came from Balmayne's lips.It may be assumed that the same conditions apply to the standards of a common planing machine, but the case is different; the upright framing is easily made strong enough by increasing its depth; but the strain upon running joints is as the distance from them at which a force is applied, or to employ a technical phrase, as the amount of overhang. With a moving platen the larger and heavier a piece to be planed, the more [132] firmly a platen is held down; and as the cross section of pieces usually increases with their depth, the result is that a planing machine properly constructed will act nearly as well on thick as thin pieces."You are quite certain of that?" Lawrence asked, meaningly.
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THREE: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.

By Elena Smith

"Even you are puzzled, uncle," Hetty said to Lawrence. She was off for the afternoon; she had called at the novelist's chambers to meet Bruce there with an eye to a little shopping and a visit to the new house in Green Street. "I know you are interested. Can't you make anything out of it?"(1.) Name some of the principal points to be kept in view in preparing designs?(2.) Why should attempts at designing be confined to one class of machinery?(3.) What objection exists to examining references when preparing designs?"The guns are horrid, madame; are you not afraid?"She looked round as if seeking inspiration. She found it presently in the housekeeper's room. Just in front of her was the glitter and sheen of the telephone. The scheme that she wanted came to her like a flash.Bruce smiled wearily.
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