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时间: 2019年12月13日 19:18

Theoretically the two-stroke and the four-stroke cycle engines possess exactly the same thermal efficiency, but actually this is modified by a series of practical conditions which to some extent tend to neutralise the very strong case in favour of the two-stroke cycle engine. The specific capacity of the engine operating on the two-stroke principle is theoretically twice that of one operating on the four-stroke cycle, and consequently, for equal power, the former should require only about half the cylinder volume of the latter; and, owing to the greater superficial area of the smaller cylinder, relatively, the latter should be far more easily cooled than the larger four-stroke cycle cylinder; thus it should be possible to get higher compression pressures, which in turn should result in great economy of working. Also the obtaining of a working impulse in the cylinder for each revolution of the crankshaft should give a great advantage in regularity of rotation鈥攚hich it undoubtedly does鈥攁nd the elimination of the operating gear for the valves, inlet and exhaust, should give greater simplicity of design. II MULTIPLICITY OF IDEAS 鈥楾he glorious Sun hath reached the farthest west, A company of the Khyber Rifles are quartered there in the old buildings and the officers' deserted bungalows; over all hangs an atmosphere of icy desolation and overpowering melancholy. Above our heads a flight of eagles wheeled against the sky. III SIR GEORGE CAYLEY鈥擳HOMAS WALKER And so, on both sides of the way there are rice-fields without end; those that were reaped yesterday are ploughed again to-day. 人成午夜免费视频_午夜男人免费福利视频_2019视频午夜福利-老司机2019福利精品视频导航 Another temple鈥攃arved and pierced, and loaded and overloaded with ornament. In the crypt was a bas-relief representing the ceremony of marriage: the procession, the couple in front of the altar, the relations sitting round, all alike in the same crouching attitude, like toys set out by a little child. Then the model of a very famous temple elsewhere in India: columns, gateways, statues of the gods, all reproduced with microscopic exactitude down to the minutest details; and surrounding this tiny model a bas-relief of the most bewildering perspective鈥攁 plan of Satrunji with its fifty-two principal temples, its trees and sacred tanks; and as a pendant to this representation, a circular carving giving a bird's-eye view of the crowd, the same little doll-like figures[Pg 79] repeated again and again, coming to worship with arms and legs spread out, grovelling, as if they were swimming. [The others kneel.] In landing, the airship collided with a pear-tree, which damaged the bows and tore open two sections of the envelope, but repairs on the spot enabled the return journey to Friedrichshafen to be begun 24 hours later. In spite of the mishap the Zeppelin had once more proved itself as a possible engine of war, and thenceforth Germany pinned its faith to the dirigible, only developing the aeroplane to such an extent as to keep abreast of other nations. By the outbreak of war, nearly 30 Zeppelins had been constructed; considerably more than half of these were destroyed in various ways, but the experiments carried on with each example of the type permitted of improvements being made. The first fatality occurred in September, 1913, when the fourteenth Zeppelin to be constructed, known as Naval Zeppelin358 L.1, was wrecked in the North Sea by a sudden storm and her crew of thirteen were drowned. About three weeks after this, Naval Zeppelin L.2, the eighteenth in order of building, exploded in mid-air while man?uvring over Johannisthal. She was carrying a crew of 25, who were all killed. Judy One of the most remarkable results attained was the production of a gasoline engine furnishing over fifty continuous horse-power for a weight of 120 lbs.