Should we, ma'am? Francesco Lana, son of a noble family, was born in 1631; in 1647 he was received as a novice into the Society of Jesus at Rome, and remained a pious member of the Jesuit society until the end of his life. He was greatly handicapped in his scientific investigations by the vows of poverty which the rules of the Order imposed on him. He was more scientist than priest all his life; for two years he held the post of Professor of Mathematics at Ferrara, and up to the time of his death, in 1687, he spent by far the greater part of his time in scientific research. He had the dubious advantage of living in28 an age when one man could cover the whole range of science, and this he seems to have done very thoroughly. There survives an immense work of his entitled, Magisterium Natur? et Artis, which embraces the whole field of scientific knowledge as that was developed in the period in which Lana lived. In an earlier work of his, published in Brescia in 1670, appears his famous treatise on the aerial ship, a problem which Lana worked out with thoroughness. He was unable to make practical experiments, and thus failed to perceive the one insuperable drawback to his project鈥攐f which more anon. pk10免费计划软件手机 In a way, Louis Bleriot ranks before Farman in point of time; his first flapping-wing model was built as early as 1900, and Voisin flew a biplane glider of his on the Seine in the very early experimental days. Bleriot鈥檚 first four machines were biplanes, and his fifth, a monoplane, was wrecked almost immediately after its construction. Bleriot had studied Langley鈥檚 work to a certain extent, and his sixth construction was a double monoplane based on the Langley principle. A month after he had wrecked this without damaging himself鈥攆or Bleriot had as many miraculous escapes as any of the other fliers鈥攈e brought out number seven, a fairly average monoplane. It was in December of 1907 after a series of flights that he wrecked this machine,212 and on its successor, in July of 1908, he made a flight of over 8 minutes. Sundry flights, more or less successful, including the first cross-country flight from Toury to Artenay, kept him busy up to the beginning of November, 1908, when the wreckage in a fog of the machine he was flying sent him to the building of 鈥榥umber eleven,鈥?the famous cross-channel aeroplane. IV THE MILITARY DIRIGIBLE Original machine and engine, with the addition of pontoons which weighed 300 lbs. The evolution of the motor-car led to the adoption of the vertical type of internal combustion engine in preference to any other, and it followed naturally that vertical engines should be first used for aeroplane propulsion, as by taking an engine that had been developed to some extent, and adapting it to its new work, the problem of mechanical flight was rendered easier than if a totally new type had had to be evolved. It was quickly realised鈥攂y the Wrights, in fact鈥攖hat the minimum of weight per horse-power was the prime requirement for the successful development of heavier-than-air machines, and at the same time it was equally apparent that the utmost reliability had to be obtained from the engine, while a third requisite was economy, in order to reduce the weight of petrol necessary for flight. Oh鈥攖ell him inquiries will be made in the proper quarters. "There鈥攜ou made me forget that test, with your confounded suicide," reproached Kennedy. "That sample's ruined." Why, you see, Mr. Errington, we are not in the habit of giving long credit, unless to a few old-established customers who deal largely with us. It would not suit our style of doing business. And it was reported that you were not settled permanently here. And鈥攁nd鈥攐ne or two unpleasant things had been said. But I hope you will not continue to feel so greatly offended with us for sending in the account. It was merely in the regular way of our transactions, I assure you. Henry Farman made his first appearance in the222 history of aviation with a flight of 935 feet on a Voisin biplane on October 15th, 1907. On October 25th, in a flight of 2,530 feet, he made the first recorded turn in the air, and on March 29th, 1908, carrying Leon Delagrange on a Voisin biplane, he made the first passenger flight. On April 10th of this year, Delagrange, in flying 1? miles, made the first flight in Europe exceeding a mile in distance. He improved on this by flying 10? miles at Milan on June 22nd, while on July 8th, at Turin, he took up Madame Peltier, the first woman to make an aeroplane flight. Another early effort, undated, but possibly a year or two later, is addressed, 鈥楾o Dolly, the sweet little bud of the morn,鈥欌€攏o doubt to the same favourite sister, Dorothea Laura.