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_视频在线观看-爱奇艺搜索

时间: 2019年12月15日 08:26

The pious and respectable Mr. Gibbs shook his head disapprovingly at this profane speech, and went back to his stool in the outer office with a lowering brow. Col. Good-morrow, Weasel. An old campaigner, you see, learns to be an early riser. Not at all, returned old Max decisively. "The loving heart and the esteem and respect are due to my Rhoda if she hadn't a penny. In return for her fortin' I expect something over and above." The development of the aeroplane between 1912 and 1914 can be judged by comparison of the requirements of the British War Office in 1912 with those laid down in an official memorandum issued by the War Office in February, 1914. This latter called for a light scout aeroplane, a single-seater, with fuel capacity to admit of 300 miles range and a speed range of from 50 to 85 miles per hour. It had to be able to climb 3,500 feet in five minutes, and the engine had to be so constructed that the pilot could start it without assistance. At the same time, a heavier type of machine for reconnaissance work was called for, carrying fuel240 for a 200 mile flight with a speed range of between 35 and 60 miles per hour, carrying both pilot and observer. It was to be equipped with a wireless telegraphy set, and be capable of landing over a 30 foot vertical obstacle and coming to rest within a hundred yards鈥?distance from the obstacle in a wind of not more than 15 miles per hour. A third requirement was a heavy type of fighting aeroplane accommodating pilot and gunner with machine gun and ammunition, having a speed range of between 45 and 75 miles per hour and capable of climbing 3,500 feet in 8 minutes. It was required to carry fuel for a 300 mile flight and to give the gunner a clear field of fire in every direction up to 30 degrees on each side of the line of flight. Comparison of these specifications with those of the 1912 trials will show that although fighting, scouting, and reconnaissance types had been defined, the development of performance compared with the marvellous development of the earlier years of achieved flight was small. 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. Miss Chubb was a little shocked at this singularly prosaic and unemotional way of treating the subject of love and marriage, as to which she herself preserved the most romantic freshness of ideas. She would have liked the young couple to be like the lovers in a story-book, and the father to bestow his daughter and his blessing with tears of joy. However, she did her best to encourage Mr. Maxfield in giving his consent after his own fashion, and they parted on excellent terms with each other. _视频在线观看-爱奇艺搜索 Lilienthal鈥檚 work did not end with simple gliding, though he did not live to achieve machine-driven flight. Having, as he considered, gained sufficient experience with gliders, he constructed a power-driven machine which weighed altogether about 90 lbs., and this was thoroughly tested. The extremities of its wings were made to flap, and the driving power was obtained from a cylinder of compressed carbonic acid gas, released through a hand-operated valve which, Lilienthal anticipated, would keep the machine in the air for four minutes. There were certain minor accidents to the mechanism, which delayed the trial flights, and on the day that Lilienthal had determined to make his trial he made a long gliding flight with a view to testing a new form of rudder that鈥攁s Pilcher relates鈥攚as worked by movements of his head. His death came about through the causes that Pilcher states; he fell101 from a height of 50 feet, breaking his spine, and the next day he died. One of the most remarkable results attained was the production of a gasoline engine furnishing over fifty continuous horse-power for a weight of 120 lbs. Algernon spoke with indignant heat and rapidity鈥攁 calculated heat, a purposed rapidity meant to have a confusing effect on the preacher, and which had that effect; but which also excited a sympathetic indignation in many of the auditors. Powell looked wildly around him, and clasped his hands above his head. Old Maxfield duly paid his visit to Miss Chubb. The good-natured little woman waited at home all day lest she should miss him. And about an hour after her early dinner Mr. Maxfield sent in his respects, and would be glad to have a word with her if she were at leisure. Now gently-falling dews refresh the earth,