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时间: 2019年12月06日 06:25

Gentlemen, he said, with less courtesy than he would otherwise have shown, "I do not know you. I am occupied, and cannot spare you any time this morning." There was a sensation in the court. Directly the door was shut, the major turned to Edith, and said, Oh, you are quite mistaken if you think Ancram cares particularly for clever women! said Castalia, whose thoughts instantly reverted to Minnie Bodkin. "Even Miss Bodkin, whom everybody declares to be such a wonder of talent, bores him sometimes, I can tell you. Of course he has known her from his childhood, and all that; but he said to me only yesterday that she was conceited, and too fond of preaching. So you see! I daresay, poor thing, she fancies all the time that she is enchanting him by her wisdom." I went to Mrs. Baynham's sometimes on her day; but I didn't care about going to Glenaveril. It is all too grand and too fine鈥攁nd I don't like Mr. Crowther. At the close of the seven days' retreat, McClellan, who had with a magnificent army thrown away a series of positions, writes to Lincoln that he (Lincoln) "had sacrificed the army." In another letter, McClellan lays down the laws of a national policy with a completeness and a dictatorial utterance such as would hardly have been justified if he had succeeded through his own military genius in bringing the War to a close, but which, coming from a defeated general, was ridiculous enough. Lincoln's correspondence with McClellan brings out the infinite patience of the President, and his desire to make sure that before putting the General to one side as a vainglorious incompetent, he had been allowed the fullest possible test. Lincoln passes over without reference and apparently without thought the long series of impertinent impersonalities of McClellan. In this correspondence, as in all his correspondence, the great captain showed himself absolutely devoted to the cause he had in mind. Early in the year, months before the Peninsular campaign, when McClellan had had the army in camp for a series of months without expressing the least intention of action, Lincoln had in talking with the Secretary of War used the expression: "If General McClellan does not want to use the army just now, I would like to borrow it for a while." That was as far as the Commander-in-chief ever went in criticism of the General in the field. While operations in Virginia, conducted by a vacillating and vainglorious engineer officer, gave little encouragement, something was being done to advance the cause of the union in the West. In 1862, a young man named Grant, who had returned to the army and who had been trusted with the command of a few brigades, captured Fort Donelson and thus opened the Tennessee River to the advance of the army southward. The capture of Fort Donelson was rendered possible by the use of mortars and was the first occasion in the war in which mortars had been brought to bear. I chanced to come into touch with the record of the preparation of the mortars that were supplied to Grant's army at Cairo. Sometime in the nineties I was sojourning with the late Abram S. Hewitt at his home in Ringwood, New Jersey. I noticed, in looking out from the piazza, a mortar, properly mounted on a mortar-bed and encompassed by some yards of a great chain, placed on the slope overlooking the little valley below, as if to protect the house. I asked my host what was the history of this piece of ordnance. "Well," he said, "the chain you might have some personal interest in. It is a part of the chain your great-uncle Israel placed across the river at West Point for the purpose of blocking or at least of checking the passage of the British vessels. The chain was forged here in the Ringwood foundry and I have secured a part of it as a memento. The mortar was given to me by President Lincoln, as also was the mortar-bed." This report naturally brought out the further question as to the grounds for the gift. "I made this mortar-bed," said Hewitt, "together with some others, and Lincoln was good enough to say that I had in this work rendered a service to the State. It was in December, 1861, when the expedition against Fort Donelson and Fort Henry was being organised at Fort Cairo under the leadership of General Grant. Grant reported that the field-pieces at his command would not be effective against the earthworks that were to be shelled and made requisition for mortars." The mortar I may explain to my unmilitary readers is a short carronade of large bore and with a comparatively short range. The mortar with a heavy charge throws its missile at a sharp angle upwards, so that, instead of attempting to go through an earthwork, it is thrown into the enclosure. The recoil from a mortar is very heavy, necessitating the construction of a foundation called a mortar-bed which is not only solid but which possesses a certain amount of elasticity through which the shock of the recoil is absorbed. It is only through the use of such a bed that a mortar can be fired from the deck of a vessel. Without such, protection, the shock would smash through the deck and might send the craft to the bottom. 青青草在线视频 青青青免费视频在线观看 青青草原绿色华人视频 青青草原网站手机版 Algernon turned upon her eagerly. You don't? exclaimed Roland furiously. The British Military Aeroplane Competition held in the summer of 1912 had done much to show the requirements in design by giving possibly the first opportunity for a definite comparison of the performance of different machines as measured by impartial observers on standard lines鈥攁lbeit the methods of measuring were crude. These showed that a high speed鈥攆or those days鈥攐f 75 miles an hour or so was attended by disadvantages in the form of an equally fast low speed, of 50 miles per hour or more, and generally may297 be said to have given designers an idea what to aim for and in what direction improvements were required. In fact, the most noticeable point perhaps of the machines of this time was the marked manner in which a machine that was good in one respect would be found to be wanting in others. It had not yet been possible to combine several desirable attributes in one machine. The nearest approach to this was perhaps to be found in the much discussed Government B.E.2 machine, which was produced from the Royal Aircraft Factory at Farnborough, in the summer of 1912. Though considerably criticised from many points of view it was perhaps the nearest approach to a machine of all-round efficiency that had up to that date appeared. The climbing rate, which subsequently proved so important for military purposes, was still low, seldom, if ever, exceeding 400 feet per minute; while gliding angles (ratio of descent to forward travel over the ground with engine stopped) little exceeded 1 in 8. Engineering problems generally go to prove that too close an imitation of nature in her forms of reciprocating motion is not advantageous; it is impossible to copy the minutiae of a bird鈥檚 wing effectively, and the bird in flight depends on the tiniest details of its feathers just as much as on the general principle on which the whole wing is constructed. Bird flight, however, has attracted many experimenters, including even Lilienthal; among others may be mentioned F. W. Brearey, who invented what he called the 鈥楶ectoral cord,鈥?which stored energy on each upstroke of the artificial wing; E. P. Frost; Major R. Moore, and especially Hureau de Villeneuve, a most enthusiastic student of this form84 of flight, who began his experiments about 1865, and altogether designed and made nearly 300 artificial birds. One of his later constructions was a machine in bird form with a wing span of about 50 ft.; the motive power for this was supplied by steam from a boiler which, being stationary on the ground, was connected by a length of hose to the machine. De Villeneuve, turning on steam for his first trial, obtained sufficient power to make the wings beat very forcibly; with the inventor on the machine the latter rose several feet into the air, whereupon de Villeneuve grew nervous and turned off the steam supply. The machine fell to the earth, breaking one of its wings, and it does not appear that de Villeneuve troubled to reconstruct it. This experiment remains as the greatest success yet achieved by any machine constructed on the ornithopter principle. Yes.