鈥淕ive me your arm,鈥?said Ernest, 鈥渁nd take me into Piccadilly, and put me into a cab, and come with me at once, if you can spare time, to Mr. Overton鈥檚 at the Temple.鈥? I thought that might be got for Ancram, Belinda. "Aw, indeed," said the officer, "I should never have dreamed that your friend was an Indian girl. Have you had much difficulty in acquiring a knowledge of English?" asked the lieutenant. 北京赛车冠军大小买法 I thought that might be got for Ancram, Belinda. To recapitulate鈥攊n the course of these original experiments the Wrights confirmed Lilienthal鈥檚 theory of the reversal of the centre of pressure on cambered surfaces at small angles of incidence: they confirmed the importance of high aspect ratio in respect to lift: they had evolved new and more accurate tables of lift and pressure on cambered surfaces: they were the first to use a movable horizontal elevator for controlling height: they were the first to adjust the wings to different angles of incidence to maintain lateral balance: and they were the first to use the movable rudder and adjustable wings in combination. Oh, I daresay. Well, if you funk it you needn't come. There's plenty without you. It may thus be seen that the two-stroke cycle type got as far as actual experiment in air work, and that with considerable success. So far, however, the greater reliability of the four-stroke cycle has rendered it practically the only aircraft engine, and the two-stroke has yet some way to travel before it becomes a formidable competitor, in spite of its admitted theoretical and questioned practical advantages. Good heavens, Castalia! What does this mean? 鈥淚f you鈥檒l come with me.鈥? She slunk along in the shadow of the houses, frightened at the faint sound of her own footfall on the flagstones, starting nervously at every noise, hurrying across the lighted spaces in front of the few shops that remained open with averted face and beating heart, fearing to be noticed by those within. But never once did she falter in her purpose of following her husband. She would have been turned back by no obstacle short of one which defied her physical powers to pass it. Renard, a French officer who had studied the problem of dirigible construction since 1878, associated himself first with a brother officer named La Haye, and subsequently with another officer, Krebs, in the construction of the second dirigible to be electrically-propelled. La Haye first approached Colonel Laussedat, in charge of the Engineers of the French Army, with a view to obtaining funds, but was refused, in consequence of the practical failure of all experiments since 1870. Renard, with whom Krebs had now associated himself, thereupon went to Gambetta, and succeeded in getting a promise of a grant of 锟?,000 for the work; with this promise Renard and Krebs set to work. * An indescribable monster, supposed to have supernatural powers. I thought that might be got for Ancram, Belinda. 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.