时间: 2019年12月13日 02:21

In a few moments James came running downstairs and begged Algernon, almost in a whisper, to walk up to his lordship's room. The abnormal needs of the war period brought many British firms into the ranks of Vee-type engine-builders, and, apart from those mentioned, the most notable types produced are the Rolls-Royce and the Napier. The first mentioned of these firms, previous to 1914, had concentrated entirely on car engines, and their very high standard of production in this department of internal combustion engine work led, once they took up the making of aero engines, to extreme efficiency both of design and workmanship. The first experimental aero engine, of what became known as the 鈥楨agle鈥?type, was of Vee design鈥攊t was completed in March of 1915鈥攁nd was so successful that it was standardised for quantity production. How far the original was from the perfection subsequently ascertained is shown by the steady increase in developed horse-power of the type; originally designed to develop 200 horse-power, it was developed and improved before its first practical trial in October of 1915, when it developed 255 horse-power on a brake test. Research and experiment produced still further improvements, for, without any enlargement of the dimensions, or radical alteration in design, the power of the engine was brought up to 266 horse-power by March of 1916, the rate of revolutions of 1,800 per minute being maintained throughout.413 July, 1916, gave 284 horse-power; by the end of the year this had been increased to 322 horse-power; by September of 1917 the increase was to 350 horse-power, and by February of 1918 the 鈥楨agle鈥?type of engine was rated at 360 horse-power, at which standard it stayed. But there is no more remarkable development in engine design than this, a 75 per cent increase of power in the same engine in a period of less than three years. � Meanwhile, Castalia wandered about her own house "like a ghost," as the servants said. She went from the little dining-room to the drawing-room, and then she painfully mounted the steep staircase to her bed-room, opened the door of her husband's little dressing-closet, shut it again, and went downstairs once more. She could not sit still; she could not read; she could not even think. She could only suffer, and move about restlessly, as if with a dim instinctive idea of escaping from her suffering. Presently she began to open the drawers of a little toy cabinet in the drawing-room, and examine their contents, as if she had never seen them before. From that she went to a window-seat, made hollow, and with a cushioned lid, so that it served as a seat and a box, and began to rummage among its contents. These consisted chiefly of valueless scraps, odds and ends, put there to be hidden and out of the way. Among them were some of poor Mrs. Errington's wedding-presents to her son and daughter-in-law. Castalia's maid, Slater, had unceremoniously consigned these to oblivion, together with a few other old-fashioned articles, under the generic name of "rubbish." There was a pair of hand-screens elaborately embroidered in silk, very faded and out of date. Mrs. Errington declared them to be the work of her grand-aunt, the beautiful Miss Jacintha Ancram, who made such a great match, and became a Marchioness. There was an ancient carved ivory fan, yellow with age, brought by a cadet of the house of Ancram from India, as a present to some forgotten sweetheart. There was a little cardboard box, covered with fragments of raised rice-paper, arranged in a pattern. This was the work of Mrs. Errington's own hands in her school-girl days, and was of the kind called then, if I mistake not, "filagree work." Castalia took these and other things out of the window-seat, and examined them and put them back, one by one, moving exactly like an automaton figure that had been wound up to perform those motions. When she came to the filagree box, she opened that too. There was a Tonquin bean in it, filling the box with its faint sweet odour. There was a pair of gold buckles, that seemed to be attenuated with age; and a garnet-brooch, with one or two stones missing. And then at the bottom of the box was something flat, wrapped in silver paper. She unwrapped it and looked at it. There is one story of 1914 that must be included, however briefly, in any record of aeronautical achievement, since it demonstrates past question that to Professor Langley really belongs the honour of having achieved a design which would ensure actual flight, although the series of accidents which attended his experiments gave to the Wright Brothers the honour of first leaving the earth and descending without accident in a power-driven heavier-than-air machine. In March, 1914, Glenn Curtiss was invited to send a flying boat to Washington for the celebration of 鈥楲angley Day,鈥?when he remarked, 鈥業 would like to put the Langley aeroplane itself in the air.鈥?In consequence of this remark, Secretary Walcot of the Smithsonian Institution authorised Curtiss to re-canvas the original Langley aeroplane and launch it either under its own power or with a more recent engine and propeller. Curtiss completed this, and had the machine ready on the shores of Lake Keuka, Hammondsport, N.Y., by May. The main object of these renewed trials was to show whether the original Langley machine was capable of sustained free flight with a pilot, and a secondary object was to determine more fully the advantages of the tandem monoplane type; thus the aeroplane was first244 flown as nearly as possible in its original condition, and then with such modifications as seemed desirable. The only difference made for the first trials consisted in fitting floats with connecting trusses; the steel main frame, wings, rudders, engine, and propellers were substantially as they had been in 1903. The pilot had the same seat under the main frame and the same general system of control. He could raise or lower the craft by moving the rear rudder up and down; he could steer right or left by moving the vertical rudder. He had no ailerons nor wing-warping mechanism, but for lateral balance depended on the dihedral angle of the wings and upon suitable movements of his weight or of the vertical rudder. Having got off the earth, the very early balloonists set about the task of finding a means of navigating the air, but, lacking steam or other accessory power to human muscle, they failed to solve the problem. Joseph Mongolfier speedily exploded the idea of propelling a balloon either by means of oars or sails, pointing out that even in a dead calm a speed of five miles an hour would be the limit achieved. Still, sailing balloons were constructed, even up to the time of Andree, the explorer, who proposed to retard the speed of the balloon by ropes dragging on the ground, and then to spread a sail which should catch the wind and permit of deviation of the course. It has been proved that slight divergences from the course of the wind can be obtained by this means, but no real navigation of the air could be thus accomplished. 日本无吗不卡高清免费dv-日本无吗无卡v清免费-日本无码不卡中文免费v Stringfellow and Henson became associated,60 after the conception of their design, with an attorney named Colombine, and a Mr Marriott, and between the four of them a project grew for putting the whole thing on a commercial basis鈥擧enson and Stringfellow were to supply the idea; Marriott, knowing a member of Parliament, would be useful in getting a company incorporated, and Colombine would look after the purely legal side of the business. Thus an application was made by Mr Roebuck, Marriott鈥檚 M.P., for an act of incorporation for 鈥楾he Aerial Steam Transit Company,鈥?Roebuck moving to bring in the bill on the 24th of March, 1843. The prospectus, calling for funds for the development of the invention, makes interesting reading at this stage of aeronautical development; it was as follows:鈥? � � � �