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亚洲一日韩欧美中文字幕在线

时间: 2019年12月16日 09:45

Kept in the Dark,..... 1882 Danti鈥檚 story may be taken as fact or left as fable, and with it the period of legend or vague statement may be said to end鈥攖he rest is history, both of genuine14 experimenters and of charlatans. Such instances of legend as are given here are not a tithe of the whole, but there is sufficient in the actual history of flight to bar out more than this brief mention of the legends, which, on the whole, go farther to prove man鈥檚 desire to fly than his study and endeavour to solve the problems of the air. Borelli was a versatile genius. Born in 1608, he was practically contemporary with Francesco Lana, and there is evidence that he either knew or was in correspondence with many prominent members of the Royal Society of Great Britain, more especially with John Collins, Dr Wallis, and Henry Oldenburgh, the then Secretary of the Society. He was author of a long list of scientific essays, two of which only are responsible for his fame, viz., Theorice Medic?arum Planetarum, published in Florence, and the better known posthumous De Motu Animalium. The first of these two is an astronomical study in which Borelli gives evidence of an instinctive knowledge of gravitation, though no definite expression is given of this. The second work, De Motu Animalium, deals with the mechanical action of the limbs of birds and animals and with a theory of the action of the internal organs. A section of the first part of this work, called De Volatu, is a study of bird flight; it is quite independent of Da Vinci鈥檚 earlier22 work, which had been forgotten and remained unnoticed until near on the beginning of practical flight. In the matter of rigid design it was not until 1913 that the British Admiralty got over the fact that the 鈥楳ayfly鈥?would not, and decided on a further attempt at the construction of a rigid dirigible. The contract for this was signed in March of 1914; work was suspended in the following February and begun again in July, 1915, but it was not until January of 1917 that the ship was finished, while her trials were not completed until March of 1917, when she was taken over by the Admiralty. The details of the construction and trial of this vessel, known as 鈥楴o. 9,鈥?go to show that she did not quite fill the contract requirements in respect of disposable lift until a number of alterations had been made. The contract specified that a speed of at least366 45 miles per hour was to be attained at full engine power, while a minimum disposable lift of 5 tons was to be available for movable weights, and the airship was to be capable of rising to a height of 2,000 feet. Driven by four Wolseley Maybach engines of 180 horse-power each, the lift of the vessel was not sufficient, so it was decided to remove the two engines in the after car and replace them by a single engine of 250 horse-power. With this the vessel reached the contract speed of 45 miles per hour with a cruising radius of 18 hours, equivalent to 800 miles when the engines were running at full speed. The vessel served admirably as a training airship, for, by the time she was completed, the No. 23 class of rigid airship had come to being, and thus No. 9 was already out of date. � Now, the fact was that Algernon distinctly remembered having placed Minnie's note in a drawer of a little secretaire which he kept habitually locked, and of which the key was at that moment in his waistcoat pocket. And the discovery that his wife had in some way or other obtained access to the said secretaire gave him, for reasons known only to himself, abundant food for conjecture and reflection during the rest of the drive home. 亚洲一日韩欧美中文字幕在线 When Mrs. Algernon Errington returned to the drawing-room, she found Violet in her old seat near the pianoforte; but Rose had shifted her position, and was standing near the window. Straining your eyes by this twilight! That's very wrong. John Stringfellow died on December 13th, 1883. His place in the history of aeronautics is at least equal to that of Cayley, and it may be said that he laid the foundation of such work as was subsequently accomplished by Maxim, Langley, and their fellows. It was the coming of the internal combustion engine that rendered flight practicable, and had this prime mover been available in John Stringfellow鈥檚 day the Wright brothers鈥?achievement might have been antedated by half a century. Did he鈥攄id he stay long? Castalia trembled from head to foot as she looked on the two rosy simpering faces. A curious ripple or tremor ran over her body, such as may be observed in persons recovering consciousness after a swoon. She tore the drawing into small fragments. Her teeth were set. Her eyes glared. She looked like a murderess. She trod the scattered bits into the carpet with her heel. Then, as if with an afterthought, she swept them contemptuously into the bright steel shovel, and threw them into the fire, and stood and watched them blaze and smoulder. After that she wrapped her shawl more tightly round her鈥攕he had forgotten to remove either it or her bonnet on coming in鈥攁nd went out at the front door, and walked straight into Whitford, and to Jonathan Maxfield's house.