鈥淚n matters like that, no, ma tante,鈥?said F茅lise. 鈥淚 don鈥檛 feel like it,鈥?said he. 鈥楾he foregoing reasoning is based upon facts, which tend to show that the flight of the largest and heaviest of all birds is really performed with but a small amount of force, and that man is endowed with sufficient muscular power to enable him also to take individual and extended flights, and that success is probably only involved in a question of suitable mechanical adaptations. But if the wings are to be modelled in imitation of natural examples, but very little consideration will serve to demonstrate its utter impracticability when applied in these forms.鈥? Other people' don't cry in my company. The doctrine thus set forth might appear plausible, but it is based on the common misconception that all the force which might be put into the helicopter or 鈥榩t茅rophore鈥?would be utilised for lifting or propelling the vehicle through the air, just as a propeller uses all its power to drive a ship through water. But, in applying such a propelling force to the air, most of the force is utilised in maintaining aerodynamic support鈥攁s a matter of fact, more force is needed to maintain this support than the muscle of man could possibly furnish to a lifting screw, and even if the helicopter were applied to a full-sized, engine-driven air vehicle, the rate of ascent would depend on the amount of surplus power that could be carried. For example, an upward lift of 1,000 pounds from a propeller 15 feet in diameter would demand an expenditure of 50 horse-power under the best possible conditions, and in order to lift this load vertically through such atmospheric pressure as exists41 at sea-level or thereabouts, an additional 20 horse-power would be required to attain a rate of 11 feet per second鈥?0 horse-power must be continually provided for the mere support of the load, and the additional 20 horse-power must be continually provided in order to lift it. Although, in model form, there is nothing quite so strikingly successful as the helicopter in the range of flying machines, yet the essential weight increases so disproportionately to the effective area that it is necessary to go but very little beyond model dimensions for the helicopter to become quite ineffective. Meanwhile Bigourdin beamed over the letter to his elder sister Clothilde, a comfortable and almost opulent widow who lived at Chartres. They had not met for a dozen years, it is true, and she had only once seen F茅lise; but the sense of the family is very strong in France, especially where marriage alliances are concerned, and he had no doubt that she would telegraph, as requested, and authorise him to entrust F茅lise to her keeping. Verily it had been an inspiration. It was a solution of difficulties. The Viriots had given signs of an almost indecent hurry, which naturally had scared F茅lise. A month was a long time. Clothilde was a woman of experience, tact and good sense. She would know how to bring F茅lise to a reasonable state of mind. If she did not succeed鈥攚ell鈥攈e was not the man to force his little F茅lise into a distasteful marriage. In any case he had a month鈥檚 respite. 日本无吗无卡v清免费,日本一大免费高清2019 It must not be inferred that the wheels of incident in connection with the lives of George Morrison and Chrissy had ceased to move during the twenty-one years of separation. Strange things were happening on the lonely shores of the settlement in the wilderness, where the once bright and joyous Chrissy was pining away her life. Still stranger things were happening to her absent lover. 鈥淚鈥檒l think of it,鈥?smiled Martin. Whatever it was to be, it must be something which he should like as much as other boys liked cricket or football, and he must think the wish for it to have come originally from himself; it was not very easy to find anything that would do, but ere long it occurred to her that she might enlist his love of music on her side, and asked him one day when he was spending a half-holiday at her house whether he would like her to buy an organ for him to play on. Of course, the boy said yes; then she told him about her grandfather and the organs he had built. It had never entered into his head that he could make one, but when he gathered from what his aunt had said that this was not out of the question, he rose as eagerly to the bait as she could have desired, and wanted to begin learning to saw and plane so that he might make the wooden pipes at once. Pilcher starting on glide with the 鈥楤at.鈥? Yes, Mr. Powell, she is his wife; and more's the pity, if all tales be true!