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时间: 2019年12月07日 04:51

No doubt Roland will envy you, said Mr. Kenyon. "I am sure he would prefer the city to our quiet little country village. But I cannot make up my mind to part with him. He is my own son, and though I endeavor to treat you both alike, of course that makes some difference," said Mr. Kenyon, in rather an apologetic tone. The value of air work in war, especially so far as the Colonial campaigns in which British troops are constantly being engaged is in question, was very thoroughly demonstrated in a report issued early in 1920 with reference to the successful termination of the Somaliland campaign through the intervention of the Royal Air Force, which between January 21st and the 31st practically destroyed the Dervish force under the Mullah, which had been a thorn in the side of Britain since 1907. Bombs and machine-guns did the work, destroying fortifications and bringing about the surrender of all the Mullah鈥檚 following, with the exception of about seventy who made their escape. There was only one other servant in the little household鈥擺Pg 28]a bouncing, rosy-cheeked Cornish girl, who was very industrious under Tabitha's eye, and very idle when she was out of that faithful housekeeper's ken. Tabitha cooked and took care of everything, and for the most part waited upon her mistress in this time of widowhood, although Susan was supposed to be parlour-maid. She was silent, listening to his reproaches with a sullen dumbness, as it seemed to him, while he stood there in his agony of doubt鈥攊n his despairing love. He turned from her with a heart-broken sigh, and slowly left the room, going away he scarce knew whither, only to put himself beyond the possibility of saying hard things to her, of letting burning, branding words flash out of the devouring fire in his heart. The question of reducing the resistance by adopting 鈥榮tream-line鈥?forms, along which the air could flow uninterruptedly without the formation of eddies, was not at first properly realised, though credit should be given to Edouard Nieuport, who in 1909 produced a monoplane with a very large body which almost completely enclosed the pilot and made the machine very294 fast, for those days, with low horse-power. On one of these machines C. T. Weymann won the Gordon-Bennett Cup for America in 1911, and another put up a fine performance in the same race with only a 30 horse-power engine. The subject, was however, early taken up by the British Advisory Committee for Aeronautics, which was established by the Government in 1909, and designers began to realise the importance of streamline struts and fuselages towards the end of this transition period. These efforts were at first not always successful and showed at times a lack of understanding of the problems involved, but there was a very marked improvement during the year 1912. At the Paris Aero Salon held early in that year there was a notable variety of ideas on the subject; whereas by the time of the one held in October designs had considerably settled down, more than one exhibitor showing what were called 鈥榤onocoque鈥?fuselages completely circular in shape and having very low resistance, while the same show saw the introduction of rotating cowls over the propeller bosses, or 鈥榮pinners,鈥?as they came to be called during the War. A particularly fine example of stream-lining was to be found in the Deperdussin monoplane on which V茅drines won back the Gordon-Bennett Aviation Cup from America at a speed of 105鈥? m.p.h.鈥攁 considerable improvement on the 78 m.p.h. of the preceding year, which was by no means accounted for by the mere increase in engine power from 100 horse-power to 140 horse-power. This machine was the first in which the refinement of 鈥榮tream-lining鈥?the pilot鈥檚 head, which became a feature of subsequent racing machines, was introduced. This consisted of a circular padded295 excresence above the cockpit immediately behind the pilot鈥檚 head, which gradually tapered off into the top surface of the fuselage. The object was to give the air an uninterrupted flow instead of allowing it to be broken up into eddies behind the head of the pilot, and it also provided a support against the enormous wind-pressure encountered. This true stream-line form of fuselage owed its introduction to the Paulhan-Tatin 鈥楾orpille鈥?monoplane of the Paris Salon of early 1912. Altogether the end of the year 1912 began to see the disappearance of 鈥榝reak鈥?machines with all sorts of original ideas for the increase of stability and performance. Designs had by then gradually become to a considerable extent standardised, and it had become unusual to find a machine built which would fail to fly. The Gnome engine held the field owing to its advantages, as the first of the rotary type, in lightness and ease of fitting into the nose of a fuselage. The majority of machines were tractors (propeller in front) although a preference, which died down subsequently, was still shown for the monoplane over the biplane. This year also saw a great increase in the number of seaplanes, although the 鈥榝lying boat鈥?type had only appeared at intervals and the vast majority were of the ordinary aeroplane type fitted with floats in place of the land undercarriage; which type was at that time commonly called 鈥榟ydro-aeroplane.鈥?The usual horse-power was 50鈥攖hat of the smallest Gnome engine鈥攁lthough engines of 100 to 140 horse-power were also fitted occasionally. The average weight per horse-power varied from 18 to 25 lbs., while the wing-loading was usually in the neighbourhood of 5 to 6 lbs. per square foot. The average speed ranged from 65-75 miles per hour. I hate him! said Carrie. "I would like to pull his hair." 俺也去网,狠狠色综合图片区,全国最大的色情网坫,欧美一级,午夜免费啪视频在线 Yes, I did. CHAPTER VIII. HERBERT ON HIS METTLE. Charles. Once more into the house, dear friends, once more. [Exit.] � Just then the door opened, and Roland entered.