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时间: 2019年12月08日 08:40

鈥業t is a remarkable fact how this proportion of wing-surface to weight extends throughout a great variety of the flying portion of the animal kingdom, even down to hornets, bees, and other insects. In some instances, however, as in the gallinaceous tribe, including pheasants, this area is somewhat exceeded, but they are known to be very poor fliers. Residing as they do chiefly on the ground, their wings are only required for short distances, or for raising them or easing their descent from their roosting-places in forest trees, the shortness of their wings preventing them from taking extended flights. The wing-surface of the common swallow is rather more than in the ratio of two square feet per pound, but having also great length of pinion, it is both swift and enduring in its flight. When on a74 rapid course this bird is in the habit of furling its wings into a narrow compass. The greater extent of surface is probably needful for the continual variations of speed and instant stoppages for obtaining its insect food. Critchley鈥檚 list of aero engines being constructed in 1910 shows twelve of the radial type, with powers of between 14 and 100 horse-power, and with from three to ten cylinders鈥攖his last is probably the greatest number of cylinders that can be successfully arranged in circular form. Of the twelve types of 1910, only two were water-cooled, and it is to be noted that these two ran at the slowest speeds and had the lowest weight per horse-power of any. Does your wife understand鈥攐r鈥攐r control the household expenditure? Some such thoughts as Lydia's probably passed through the minds of the Misses McDougall, but, of course, that was not the time or place to express them. They exerted themselves to entertain their hostess with a variety of Whitford gossip, while Castalia鈥攈er attention divided between the purse she was making and the drawing-room door, at which she hoped to see her husband presently appear鈥攎erely threw in a languid interjection now and then as her contribution to the conversation. And these five were in at the greatest conquest man had made since James Watt evolved the steam engine鈥攑erhaps even a greater conquest than that of Watt. Four flights in all were made; the first lasted only twelve seconds, 鈥榯he first in the history of the world in which a machine carrying a man had raised itself into the air by its own power in free flight, had sailed forward on a level course without reduction of speed,171 and had finally landed without being wrecked,鈥?said Wilbur Wright concerning the achievement.4 The next two flights were slightly longer, and the fourth and last of the day was one second short of the complete minute; it was made into the teeth of a 20 mile an hour wind, and the distance travelled was 852 feet. As to Algernon, there never was such a clever and brilliant little boy. At eight years old he could sing little songs to his mother's accompaniment, in the sweetest piping voice. He could recite little verses. He even drew quite so that you could tell鈥攐r Rhoda could鈥攈is trees, houses, and men from one another. 可以免费观看的av毛片 Doesn't he? Jonathan Maxfield had come to a downright quarrel with the preacher鈥攐r to something as near to a quarrel as can be attained, where the violence and vituperation are all on one side鈥攁nd had ordered Powell out of his house. This was a serious step, and was sure to be searchingly canvassed. Maxfield absented himself from the next class-meeting on the plea of ill-health. There was a general knowledge in the class and throughout the Society that there had been a breach, and many members began to take sides rather warmly. Rhoda looked up at him in genuine surprise; but her eyes fell before the answering look they encountered, and she blushed from brow to chin. I'm afraid, father, you'll not find Rhoda's looks doing us credit, said Mrs. Seth. "Why or wherefore I don't know, but these last days she has been as peaky as can be." Oh no! I beg your pardon, she answered, moving aside. As she did so young Ingleby came up, and was about to pass them when Diamond touched him on the shoulder and said, "Ingleby, have you chanced to see Mr. Errington?"