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Aviation History
1915
1915 - 0478.PDF
[/OGHTJ JULY 2, 1915. FLYING AT HENDON. PUNCTUALLY at 3 p.m. last Saturday afternoon M. Osipenko ascended on the 50 h.p. G.-W. school 'bus and put up the first exhibition flight. By the way the machine rocked and pitched, it was evident that there presently went up on the G.-W. school 'bus, and shortly after a Government biplane departed from the aero drome for some destination unknown after executing some extraordinary evolutions that left little doubt as to the identity of pilot and machine. Moore then took a passenger on his L. and P. biplane, and W. Roche-Kelly ascended on the 50 h.p. Beatty - Wright biplane. The next in the air was Osipenko on the G.-W. school 'bus, after which E. Baumann made two passenger flights on the 50 h.p. Ruffy- Baumann biplane. C. B. Prodger also took up a passenger on the 60 h.p. Beatty-Wright. G. K. Blandy was up next on the Beatty- Caudron, and then, conditions having some what improved, various school machines made their appearance. Although by now it was practically the end of the day, machine after machine got going, and at one time about half-a-dozen were up at the same time— including two Avros and a Maurice Farman paying a visit to the aerodrome. The 100 h.p. G.-W. five-seater biplane, with Osipenko piloting, was also at work with passengers. A large party of wounded soldiers with the nurses visited the aero drome and appeared to be spending a very ARE WE DOWNHEARTED?—Some of our wounded at Hendon Aerodrome, enjoyable time. The wind and rain, in spite of their might, 1 K~**~ ^J were plenty of " bumps " up aloft. Following close upon Osipenko's tail planes came J. H. Moore on his 45 h.p. L. and P. biplane. He was soon up to a couple of thousand feet or so, where conditions appeared to be steadier, and after several circuits he descended with a number of pretty spirals. Whilst W. Birchenough was testing an Aircraft Co.'s Maurice Farman "shorthorn," Marcus D. Manton ascended on the 50 h.p. G.-W. school 'bus, and R. Kenworthy took up the 45 h.p. Beatty- Caudron. This latter pilot was flying the same machine last Sunday week. By a slip we gave the pilot's name in our last report as P. A. Johnston. J. S. B. Winter W ® suffered defeat in their attempt to prevent flying on Sunday afternoon. However, mere man did not have it all his own way, as one pilot and machine received what was very nearly a knock-out " blow," for M. Osipenko, accom panied by a plucky passenger, on the 50 h.p. G.-W. school 'bus, was forced to descend in a field just outside the aerodrome. Fortunately no damage was done, and he was able to fly back later. Three other pilots took part in the battle of the elements :—Marcus D. Manton on the 50 h.p. G.-W. 'bus, J. H. Moore on his 45 h.p. L. and P, biplane, and E. Baumann on the 50 h.p. Ruffy-Baumann biplane. ® ® THE A.T. REVOLUTION COUNTER. THE A. T. Revolution Counter for aero engines, manufactured in England by the A. T. Speedometer Co., of 140, Long Acre, London, W.C., is identical in principle to the well-known car speedometers of the same make. This instrument is of the magnetic type, provided with a special compensating device, by which it is entirely unaffected by variations in temperature or change of altitude. Briefly, the action of the A. T. rev.-indicator is as follows:— A small inverted aluminium cup » mounted between jewel bearings within a bell-shaped steel magnet, which is connected to the driving mechanism from the engine and so revolves with the latter. In so doing, the magnetic lines of force flowing from pole to pole produce eddy currents of electricity in the aluminium cup. which thereby tends to revolve with the magnet. This movement is restrained by the action of a delicate hair spring, so that the cup can only turn on its axis by an amount that is proportional to the revolutions of the magnet. As the strength of the magnetic field is increased by the increasing speed of the magnet's rotation, the resistance of the spring is correspondingly overcome, and the cup is turned in pro portion. Thus it will be seen that a pointer attached to the cup, moving over a suitably graduated dial, will indicate the number of revolutions made by the engine. The aluminium cup, together with its spindle, pointer, and spring, only weighs about two grammes, and the clearance between the cup and the magnet is 1 mm. A special form of flexible drive from the engine to the instrument is employed, consisting of a chain of steel links—better described, perhaps, as a series of small universal joints connected together—enclosed by a steel spring liner, which is itself within metallic flexible tubing. 478 The A.T. revolution counter fcr aeroplane engines.
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