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时间: 2019年12月12日 00:56

412 Developing from the Vee type, the eighteen-cylinder 475 brake horse-power engine, designed during the war, represented for a time the limit of power obtainable from a single plant. It was water-cooled throughout, and the ignition to each cylinder was duplicated; this engine proved fully efficient, and economical in fuel consumption. It was largely used for seaplane work, where reliability was fully as necessary as high power. Critchley鈥檚 list of aero engines being constructed in 1910 shows twelve of the radial type, with powers of between 14 and 100 horse-power, and with from three to ten cylinders鈥攖his last is probably the greatest number of cylinders that can be successfully arranged in circular form. Of the twelve types of 1910, only two were water-cooled, and it is to be noted that these two ran at the slowest speeds and had the lowest weight per horse-power of any. Very well, ma'am. An engine of the rotary type, almost as well known as the Gnome, is the Clerget, in which both cylinders and crank case are made of steel, the former having the usual radial fins for cooling. In this type the inlet and exhaust valves are both located in the cylinder head, and mechanically operated by push-rods and rockers. Pipes are carried from the crank case to the inlet valve casings to convey the mixture to the cylinders, a carburettor of the central needle type being used. The carburetted mixture is taken into the crank case chamber in a manner similar to that of the Gnome engine. Pistons of aluminium alloy, with three cast-iron rings, are fitted, the top ring being of the obturator type. The large end of one of the nine connecting rods embraces the crank pin and the pressure is taken on two ball-bearings housed in the end of the rod. This carries eight pins,435 to which the other rods are attached, and the main rod being rigid between the crank pin and piston pin determines the position of the pistons. Hollow connecting-rods are used, and the lubricating oil for the piston pins passes from the crankshaft through the centres of the rods. Inlet and exhaust valves can be set quite independently of one another鈥攁 useful point, since the correct timing of the opening of these valves is of importance. The inlet valve opens 4 degrees from top centre and closes after the bottom dead centre of the piston; the exhaust valve opens 68 degrees before the bottom centre and closes 4 degrees after the top dead centre of the piston. The magnetos are set to give the spark in the cylinder at 25 degrees before the end of the compression stroke鈥攖wo high-tension magnetos are used; if desired, the second one can be436 adjusted to give a later spark for assisting the starting of the engine. The lubricating oil pump is of the valveless two-plunger type, so geared that it runs at seven revolutions to 100 revolutions of the engine; by counting the pulsations the speed of the engine can be quickly calculated by multiplying the pulsations by 100 and dividing by seven. In the 115 horse-power nine-cylinder Clerget the cylinders are 4鈥? bore with a 6鈥? inches stroke, and the rated power of the engine is obtained at 1,200 revolutions per minute. The petrol consumption is 0鈥?5 pint per horse-power per hour. Contemporary with Hooke was one Allard, who, in France, undertook to emulate the Saracen of Constantinople to a certain extent. Allard was a tight-rope dancer who either did or was said to have done short gliding flights鈥攖he matter is open to question鈥攁nd finally stated that he would, at St Germains, fly from the terrace in the king鈥檚 presence. He made the attempt, but merely fell, as did the Saracen some centuries before, causing himself serious injury. Allard cannot be regarded as a contributor to the development of aeronautics in any way, and is only mentioned as typical of the way in which, up to the time of the Wright brothers, flying was regarded. Even unto this day there are many who still believe that, with a pair of wings, man ought to be able to fly, and that the mathematical data necessary to effective construction simply do not exist. This attitude was reasonable enough in an unlearned age, and Allard was one鈥攁 little more conspicuous34 than the majority鈥攁mong many who made experiment in ignorance, with more or less danger to themselves and without practical result of any kind. He was as good as his word. Before the Duke鈥檚 Own left the Coast the Gazette contained both announcements, and Herbert Larkins was now 鈥榓n officer and a gentleman鈥?at last. 加勒比在线东京热在线_思思99热久久精品在线6_东京一本到熟无码视频_思思热99re热在线视频 SCENE I. That's a pleasant sort of thing, isn't it? said Algernon, who had been watching her face as she read. What's the meaning of this? asked Disney. Nancy nodded acquiescence. Some eleven months had elapsed since the last advertisement had been published,[164] offering a large reward for information concerning the marriage of Herbert Farrington and Annie Orde, but no satisfactory answer had been received. Hope was already failing all but the sanguine old Lady Farrington, who kept on declaring persistently that the right would certainly prosper in the end. As she was the only person who stoutly maintained that proofs of the marriage must certainly be forthcoming, so she was the only one who was not surprised, when one morning a mysterious letter arrived from no one knew where, and sent by no one knew whom.