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时间: 2019年12月07日 04:22

Exhibited in the Paris Aero Exhibition of 1912, the Laviator two-stroke cycle engine, six-cylindered, could be operated either as a radial or as a rotary engine, all its pistons acting on a single crank. Cylinder dimensions of this engine were 3.94 inches bore by 5.12 inches stroke, and a power output of 50 horse-power454 was obtained when working at a rate of 1,200 revolutions per minute. Used as a radial engine, it developed 65 horse-power at the same rate of revolution, and, as the total weight was about 198 lbs., the weight of about 3 lbs. per horse-power was attained in radial use. Stepped pistons were employed, the annular space between the smaller or power piston and the walls of the larger cylinder being used as a charging pump for the power cylinder situated 120 degrees in rear of it. The charging cylinders were connected by short pipes455 to ports in the crank case which communicated with the hollow crankshaft through which the fresh gas was supplied, and once in each revolution each port in the case registered with the port in the hollow shaft. The mixture which then entered the charging cylinder was transferred to the corresponding working cylinder when the piston of that cylinder had reached the end of its power stroke, and immediately before this the exhaust ports diametrically opposite the inlet ports were uncovered; scavenging was thus assisted in the usual way. The very desirable feature of being entirely valveless was accomplished with this engine, which is also noteworthy for exceedingly compact design. The brothers Robert were first to note how the heat328 of the sun acted on the gases within a balloon envelope, and it has since been ascertained that sun rays will heat the gas in a balloon to as much as 80 degrees Fahrenheit greater temperature than the surrounding atmosphere; hydrogen, being less affected by change of temperature than coal gas, is the most suitable filling element, and coal gas comes next as the medium of buoyancy. This for the free and non-navigable balloon, though for the airship, carrying means of combustion, and in military work liable to ignition by explosives, the gas helium seems likely to replace hydrogen, being non-combustible. The Maharajah of Benares sent his carriage this morning to take me to him. We went to the Ganges, where a palankin was in waiting to carry me across the narrow strip of sand between the road and the boat, escorted by a worthy who held a tall red umbrella, fringed with gold, over my head. The increase in power of the engines fitted to airships has made steady progress from the outset; Haenlein鈥檚 engine developed about 6 horse-power; the Santos-Dumont airship of 1898 was propelled by a motor of 4 horse-power; in 1902 the Lebaudy airship was fitted with an engine of 40 horse-power, while, in 1910, the Lebaudy brothers fitted an engine of nearly 300 horse-power to the airship they were then constructing鈥?,400 horse-power was common in the airships of the War period, and the later British rigids developed yet more. ever did. I wouldn't ask it except for the girl; I don't care The country was nowhere deserted. Labourers in the rice-fields were transplanting the young seedlings or watering the taller growth that waved in delicate transparent verdure. Or again, there were the watchers perched on their platforms in the middle of the fields; fishermen pushing little nets before them, fastened to triangular frames, or grubbing in the mud in search of shell-fish鈥攕mall freshwater mussels, which they carried away in clay jars of Etruscan form. A motley crowd, with animated and graceful gesticulations; the women red or white figures in fluttering sarees, with flowers in their hair, and a few glittering bangles on their arms; the children quite naked, with bead necklaces and queer charms of lead or wood in their ears or their nose; the men slender and active, wearing light-coloured turbans made of yards on yards of twisted muslin, their brown skin hidden only by the langouti or loin-cloth. 免费国产久久啪久久爱,女性生殖好看图片,和闺蜜一起双飞好爽,翘臀后进美女动态图啪,暖暖直播很黄 I will not write to my uncle! I will not. You don't care for me. You鈥攜ou deceive me, burst out Castalia. And then a storm of sobs choked her voice, and she hurried away, filling the little house with a torrent of incoherent sounds. exciting and romantic. There are such a lot of possibilities. Please don't keep this letter, but burn it. About a month ago some other bills had fallen due, and had been duly honoured. They had been given to a London wine merchant, who would certainly not have scrupled to take any strong measure for getting his money. And even the name of Jack Price was no talisman to charm away this grasping tradesman's determination to be paid for goods delivered; the wine merchant in question doing a large City business, and feeling no anxiety as to the opinion entertained by the Honourable Mr. Price's fashionable connection about himself or his wares. Under the pressure of this disagreeable conviction, the money had been found to honour the bills held by the wine merchant. Considered in a general way, the first two years after the termination of the Great European War form a period of transition in which the commercial type of aeroplane was gradually evolved from the fighting machine which was perfected in the four preceding years. There was about this period no sense of finality, but it was as experimental, in its own way, as were the years of progressing design which preceded the war period. Such commercial schemes as were inaugurated call for no more note than has been given here; they have been experimental, and, with the possible exception of the United States Government mail service, have not been planned and executed on a sufficiently large scale to furnish reliable data on which to forecast the prospects of commercial aviation. And there is a school rapidly growing up which asserts that the day of aeroplanes is nearly over. The construction of the giant airships of to-day and the successful return flight of R34 across the Atlantic seem to point to the eventual triumph, in spite of its disadvantages, of the dirigible airship.