Like Caballo, the Tarahumara secret had begun working for me before I even understood it. During the re-writing of the Logic, Dr. Whewell's Philosophy of the Inductive Sciences made its appearance; a circumstance fortunate for me, as it gave me what I greatly desired, a full treatment of the subject by an antagonist, and enabled me to present my ideas with greater clearness and emphasis as well as fuller and more varied development, in defending them against definite objections, or confronting them distinctly with an opposite theory. The controversies with Dr. Whewell, as well as much matter derived from Comte, were first introduced into the book in the course of the re-writing. Still Rhoda did not altogether despair of inducing her father to do something for Algernon. What that something might be, or how far it was possible for her father to assist young Errington, except by simply giving or lending him money, Rhoda was ignorant. Algernon in talking to her had spoken very glibly, but, to her, very unintelligibly, of bills which were in her father's hands; and had pointed out, with an air of candour and conviction, that it would be imprudent on Mr. Maxfield's part to drive matters to extremity. It had all sounded very convincing, simply from the tone in which it was said. Many of us are astonishingly uncritical as to the coherence and cogency of words if they be but set to a good tune. A careful consideration of the salient features leading to maximum efficiency in aeroplanes鈥攑articularly in regard to speed and climb, which were the two most important military requirements鈥攕howed that a vital feature was the reduction in the amount of weight lifted per horse-power employed; which in 1914 averaged from 20 to 25 lbs. This was effected both by gradual increase in the power and size of the engines used and by great improvement in their detailed design (by increasing compression ratio and saving weight whenever possible); with the result that the motive power of single-seater aeroplanes rose from 80 and 100 horse-power in 1914 to an average of 200 to 300 horse-power, while the actual weight of the engine fell from 3?-4 lbs. per horse-power to an average of 2? lbs. per horse-power. This meant that while a pre-war309 engine of 100 horse-power would weigh some 400 lbs., the 1918 engine developing three times the power would have less than double the weight. The result of this improvement was that a scout aeroplane at the time of the Armistice would have 1 horse-power for every 8 lbs. of weight lifted, compared with the 20 or 25 lbs. of its 1914 predecessors. This produced a considerable increase in the rate of climb, a good postwar machine being able to reach 10,000 feet in about 5 minutes and 20,000 feet in under half an hour. The loading per square foot was also considerably increased; this being rendered possible both by improvement in the design of wing sections and by more scientific construction giving increased strength. It will be remembered that in the machine of the very early period each square foot of surface had only to lift a weight of some 1? to 2 lbs., which by 1914 had been increased to about 4 lbs. By 1918 aeroplanes habitually had a loading of 8 lbs. or more per square foot of area; which resulted in great increase in speed. Although a speed of 126 miles per hour had been attained by a specially designed racing machine over a short distance in 1914, the average at that period little exceeded, if at all, 100 miles per hour; whereas in 1918 speeds of 130 miles per hour had become a commonplace, and shortly afterwards a speed of over 166 miles an hour was achieved. Mr. Diamond is a gentleman, father. Everybody allows that. 五月爱深深爱在线视频_久久6热视频在线观看 If you are prepared to make these claims, where is your peer reviewed data to back it up? Poor thing! I daresay it does warp her mind a good deal. What did she say to you? Meanwhile, a rather different endurance contest was taking place a few blocks from the finish line. 460 In design and construction, there was nothing abnormal about the Mercedes engine, the keynote throughout being extreme reliability and such simplification of design as would permit of mass production in different factories. Even before the war, the long list of records set up by this engine formed practical application of the wisdom of this policy; Bohn鈥檚 flight of 24 hours 10 minutes, accomplished on July 10th and 11th, 1914, is an instance of this鈥攖he flight was accomplished on an Albatross biplane with a 75 horse-power Mercedes engine. The radial type, instanced in other countries by the Salmson and Anzani makes, was not developed in Germany; two radial engines were made in that country before the war, but the Germans seemed to lose faith in the type under war conditions, or it may have been that insistence on standardisation ruled out all but the proved examples of engine. 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?