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时间: 2019年12月06日 18:51

Horatia. Why, Sir, I always thought them a sort of stone.... I don't want to converse rationally. Look here, Castalia; we had better understand one another at once. I shall begin by telling you what I have resolved upon, and what I have done, and you will then have to obey me implicitly. There must be no sort of discussion or hesitation. Come back to the house with me at once. � It was in 1910 that the British War Office first began fully to realise that there might be military226 possibilities in heavier-than-air flying. C. S. Rolls had placed a Wright biplane at the disposal of the military authorities, and Cody, as already recorded, had been experimenting with a biplane type of his own for some long period. Such development as was achieved was mainly due to the enterprise and energy of Colonel J. E. Capper, C.B., appointed to the superintendency of the Balloon Factory and Balloon School at Farnborough in 1906. Colonel Capper鈥檚 retirement in 1910 brought (then) Mr Mervyn O鈥橤orman to command, and by that time the series of successes of the Cody biplane, together with the proved efficiency of the aeroplane in various civilian meetings, had convinced the British military authorities that the mastery of the air did not lie altogether with dirigible airships, and it may be said that in 1910 the British War Office first began seriously to consider the possibilities of the aeroplane, though two years more were to elapse before the formation of the Royal Flying Corps marked full realisation of its value. Thus speaks the inventor; the cold official mind gives out a different account, crediting the 鈥楢vion鈥?with merely a few hops, and to-day, among those who consider the problem at all, there is a little group which persists in asserting that to Ader belongs the credit of the first power-driven flight, while a larger group is equally persistent in stating that, save for a few ineffectual hops, all three wheels of the machine never left the ground. It is past question that the 鈥楢vion鈥?was capable of power-driven flight; whether it achieved it or no remains an unsettled problem. 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 � Minnie seized on the opportunity, which chance had afforded her, to introduce the matter she wished to speak about. This is no secret, Mrs. Errington; at all events, not from you. That is not to say that the lifting screw must be totally ruled out so far as the construction of aircraft is concerned. Much is still empirical, so far as this branch of aeronautics is concerned, and consideration of the structural features of a propeller goes to show that the relations of essential weight and effective area do not altogether apply in practice as they stand in theory. Paucton鈥檚 dream, in some modified form, may yet become reality鈥攊t is only so short a time ago as 1896 that Lord Kelvin stated he had not the smallest molecule of faith in aerial navigation, and since the whole history of flight consists in proving the impossible possible, the helicopter may yet challenge the propelled plane surface for aerial supremacy. The first trial of this vessel was made in July of 1900, and was singularly unfortunate. The winch by which the sliding weight was operated broke, and the balloon was so bent that the working of the propellers was interfered with, as was the steering. A speed of 13 feet per second was attained, but on descending the airship ran against some piles and was further damaged. Repairs were completed by the end of September, 1900, and on a second trial flight made on October 21st a speed of 30 feet per second was reached.