时间: 2019年12月12日 14:03

The Invention has been subjected to several tests and examinations and the results are most satisfactory, so much so that nothing but the completion of the undertaking is required to determine its practical operation, which being once established its utility is undoubted, as it would be a necessary possession of every empire, and it were hardly too much to say, of every individual of competent means in the civilised world. There was a pause. This is a nice reception to give me, said Algernon, in a hard, cold voice, after they had looked at each other for a second, and Castalia had remained silent and still. In truth, she was physically unable to speak to him in that first moment of meeting. Her heart throbbed so that every beat of it seemed like an angry blow threatening her life. With us it was a well-known thing among the Faculty for miles around Ancram Park. Our extremities were never cold, nor had we ever red noses. I believe a red nose was absolutely unknown in our family. No doubt that was part of the same thing; perfect circulation of the blood. Consideration of the events in the years immediately preceding the War must be limited to as brief a summary as possible, this not only because the full history of flying achievements is beyond the compass of any single book, but also because, viewing the matter in perspective, the years 1903-1911 show up as far more important as regards both design and performance. From 1912 to August of 1914, the development of aeronautics was hindered by the fact that it had not progressed far enough to form a real commercial asset in any country. The meetings which drew vast concourses of people to such places as Rheims and Bournemouth may have been financial successes at first, but, as flying grew more common and distances and heights extended, a great many people found it other than worth while to pay for admission to an aerodrome. The business of taking up passengers for pleasure flights was not financially successful, and, although schemes for commercial routes were talked of, the aeroplane was not sufficiently advanced to warrant the investment of hard cash in any of these projects. There was a deadlock; further development was necessary in order to secure financial aid, and at the same time financial aid was necessary in order to secure further development. Consequently, neither was forthcoming. The Napier Company specialised on one type of engine from the outset, a power plant which became known as the 鈥楲ion鈥?engine, giving 450 horse-power with twelve cylinders arranged in three rows of four each. Considering the engine as 鈥榙ry,鈥?or without fuel and accessories, an abnormally light weight per horse-power鈥攐nly 1鈥?9 lbs.鈥攚as attained when running at the normal rate of revolution. The cylinders and water-jackets are of steel, and there is fitted a detachable aluminium cylinder head containing inlet and exhaust valves and valve actuating mechanism; pistons are of aluminium alloy, and there are two inlet and two exhaust valves to each cylinder, the whole of the valve mechanism being enclosed in an oil-tight aluminium case. Connecting rods and crankshaft are of steel, the latter being machined from a solid steel forging and carried in five roller bearings and one plain bearing at the forward end. The front end of the crank-case encloses reduction gear for the propeller shaft, together with the shaft and bearings. There are two suction and one pressure type oil pumps driven through gears at half-engine speed, and two 12 spark magnetos, giving 2 sparks in each cylinder. 日本人的色道 Horatia. 鈥橳is old Colonel Stumply. 460 In design and construction, there was nothing abnormal about the Mercedes engine, the keynote throughout being extreme reliability and such simplification of design as would permit of mass production in different factories. Even before the war, the long list of records set up by this engine formed practical application of the wisdom of this policy; Bohn鈥檚 flight of 24 hours 10 minutes, accomplished on July 10th and 11th, 1914, is an instance of this鈥攖he flight was accomplished on an Albatross biplane with a 75 horse-power Mercedes engine. The radial type, instanced in other countries by the Salmson and Anzani makes, was not developed in Germany; two radial engines were made in that country before the war, but the Germans seemed to lose faith in the type under war conditions, or it may have been that insistence on standardisation ruled out all but the proved examples of engine. The crankshaft is of chrome nickel steel, carried on seven bearings. Holes are drilled through each of the crank pins and main bearings, for half the diameter of the shaft, and these are plugged with pressed brass studs. Small holes, drilled through the crank cheeks, serve to convey lubricant from the main bearings to the crank pins. The propeller thrust is taken by a simple ball thrust bearing at the propeller end of the crankshaft, this thrust bearing being seated in a steel retainer which is clamped between the two halves of the crank case. At the forward end of the crankshaft there is mounted a master bevel gear on six splines; this463 bevel floats on the splines against a ball thrust bearing, and, in turn, the thrust is taken by the crank case cover. A stuffing box prevents the loss of lubricant out of the front end of the crank chamber, and an oil thrower ring serves a similar purpose at the propeller end of the crank chamber. VIII AMERICAN GLIDING EXPERIMENTS There is no portion of a novelist鈥檚 work in which this fault of episodes is so common as in the dialogue. It is so easy to make any two persons talk on any casual subject with which the writer presumes himself to be conversant! Literature, philosophy, politics, or sport, may thus be handled in a loosely discursive style; and the writer, while indulging himself and filling his pages, is apt to think that he is pleasing his reader. I think he can make no greater mistake. The dialogue is generally the most agreeable part of a novel; but it is only so as long as it tends in some way to the telling of the main story. It need not seem to be confined to that, but it should always have a tendency in that direction. The unconscious critical acumen of a reader is both just and severe. When a long dialogue on extraneous matter reaches his mind, he at once feels that he is being cheated into taking something which he did not bargain to accept when he took up that novel. He does not at that moment require politics or philosophy, but he wants his story. He will not perhaps be able to say in so many words that at some certain point the dialogue has deviated from the story; but when it does so he will feel it, and the feeling will be unpleasant. Let the intending novel-writer, if he doubt this, read one of Bulwer鈥檚 novels 鈥?in which there is very much to charm 鈥?and then ask himself whether he has not been offended by devious conversations.