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时间: 2019年12月06日 19:22

Certain American radial engines were made previous to 1914, the principal being the Albatross six-cylinder engines of 50 and 100 horse-powers. Of these the smaller size was air-cooled, with cylinders of 4鈥? inches bore and 5 inches stroke, developing the rated power at 1,230 revolutions per minute, with a weight of about 5 lbs. per horse-power. The 100 horse-power size had cylinders of 5鈥? inches bore, developing its rated power at 1,230 revolutions per minute, and weighing only 2鈥?5 lbs. per horse-power. This engine was markedly similar to the six-cylindered Anzani, having all the valves mechanically operated, and with auxiliary exhaust ports at the bottoms of the cylinders, overrun by long pistons. These Albatross engines had their cylinders arranged in two groups of three, with each427 group of three pistons operating on one of two crank pins, each 180 degrees apart. Even in 1911 the deadlock was apparent; meetings were falling off in attendance, and consequently in financial benefit to the promoters; there remained, however, the knowledge鈥攆or it was proved past question鈥攖hat the aeroplane in its then stage of development was a necessity to every army of the world. France had shown this by the more than interest taken by the French Government in what had developed into an Air Section of the French army; Germany, of course, was hypnotised by Count Zeppelin and his dirigibles, to say nothing of the Parsevals which had been proved useful military235 accessories; in spite of this, it was realised in Germany that the aeroplane also had its place in military affairs. England came into the field with the military aeroplane trials of August 1st to 15th, 1912, barely two months after the founding of the Royal Flying Corps. Except betwixt the Tulip and the Rose. Who is that fellow who has just gone out? he asked of Gibbs, entering the office by the public door instead of his own private one, in order to put the question. It may be that, as forecasted by the prophet Wells, the flapping-wing machine will yet come to its own and compete with the aeroplane in efficiency. Against this, however, are the practical advantages of the rotary mechanism of the aeroplane propeller as compared with the movement of a bird鈥檚 wing, which, according to Marey, moves in a figure of eight. The force derived from a propeller is of necessity continual, while it is equally obvious that that derived from a flapping movement is intermittent, and, in the recovery of a wing after completion of one stroke for the next, there is necessarily a certain cessation, if not loss, of power. I hope, said Mrs. Thimbleby, timidly, before leaving the room, "that the Lord will soften your daughter-in-law's heart to you in this trouble." 男人到天堂a在线,AV每日更新 在线观看,日本黄色视频,天天鲁在视频在线观看 For one day shine a blessing to my Country, 鈥楾here are some things in Indian life which would strike you as curious. For instance, I have five glass doors to my bedroom. One alone is never opened ... but through all the others people, especially my Ayah, come in; and she never knocks.... Folk can walk in from the outside of the house through two of my glass doors. It is a very public sort of living, but it is Indian fashion. The great thing is to let in abundance of air; and where air comes in other things come in too. I have, however, 鈥渃hick鈥?blinds to my outer doors; these are made of thin split bamboos; and if I let them down, no one can see in. Of course they would not keep out my dear little Ayah; she can always pop in by lifting the chicks. She is the only one who really laughs at my bad Urdu.... My Munshi laughs a little, but not in the same way. He is gentle and pleasing.鈥? Well, returned the virtuous matron, "I can't so much wonder. Having the Lord's forgiveness called down on his head in that way! And I don't know, Gladwish, as we should like it ourselves!" Cramp. [Aside.] Is the woman intoxicated or insane? �