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时间: 2019年12月15日 16:13

Some four centuries later there was published a book entitled Perugia Augusta, written by one C. Crispolti of Perugia鈥攖he date of the work in question is 1648. In it is recorded that 鈥榦ne day, towards the close of the fifteenth century, whilst many of the principal gentry had come to Perugia to honour the wedding of Giovanni Paolo Baglioni, and some lancers were riding down the street by his palace, Giovanni Baptisti Danti unexpectedly and by means of a contrivance of wings that he had constructed proportionate to the size of his body took off from the top of a tower near by, and with13 a horrible hissing sound flew successfully across the great Piazza, which was densely crowded. But (oh, horror of an unexpected accident!) he had scarcely flown three hundred paces on his way to a certain point when the mainstay of the left wing gave way, and, being unable to support himself with the right alone, he fell on a roof and was injured in consequence. Those who saw not only this flight, but also the wonderful construction of the framework of the wings, said鈥攁nd tradition bears them out鈥攖hat he several times flew over the waters of Lake Thrasimene to learn how he might gradually come to earth. But, notwithstanding his great genius, he never succeeded.鈥? Rheims Meeting: � � � Belle smiled. Sophisticated she might be. Yet no woman can be said exactly to hate flattery of the right sort. 日本一大免费高清|欧美免费观看全部完|日本片在线看的免费网站 Meusnier, experimenting in various ways, experimented with regard to the resistance offered by various shapes to the air, and found that an elliptical shape was best; he proposed to make the car boat-shaped, in order further to decrease the resistance, and he advocated an entirely rigid connection between the car and the body of the balloon, as indispensable to a dirigible.12 He suggested using three propellers, which were to be driven by hand by means of pulleys, and calculated that a crew of eighty would be required to furnish sufficient motive power. Horizontal fins were to be used to assure stability, and Meusnier thoroughly334 investigated the pressures exerted by gases, in order to ascertain the stresses to which the envelope would be subjected. More important still, he went into detail with regard to the use of air bags, in order to retain the shape of the balloon under varying pressures of gas due to expansion and consequent losses; he proposed two separate envelopes, the inner one containing gas, and the space between it and the outer one being filled with air. Further, by compressing the air inside the air bag, the rate of ascent or descent could be regulated. Lebaudy, acting on this principle, found it possible to pump air at the rate of 35 cubic feet per second, thus making good loss of ballast which had to be thrown overboard. � [232] 鈥淎nd pray what may those mysterious words be, father?鈥? This testy old gentleman with a snort of scorn for what he termed "Gyde's foolishness" put Jack through a cross-examination similar to that he had undergone from Delamare earlier in the day. Jack's answers being satisfactory, he received another note in Silas Gyde's cramped hand.