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Aviation History
1910
1910 - 0217.PDF
MARCH 19, 1910. is that it enables the rock-lever box to be kept oil- tight. In the latest design, the yokes that hold the rock-lever boxes down upon the valve-domes are fitted with valve- lifters (Fig. 9), in the form of quick-acting screws that are interconnected and controlled by a wire from the pilot's seat on the aeroplane. Accessibility has been made a feature of the Green engine, and it is interesting and instructive to investigate the arrangement of the valve-operating mechanism already described from this point of view. If it is necessary to adjust the lift of the valve the operation consists of removing one of the yokes that hold down the valve- tappet boxes. This uncovers an orifice in the top of the box through which the adjustment screw on the end of the rock-lever is accessible (Fig. 10). If it is necessary to remove a valve, or all the valves, the same yokes are released, and the caps on the brackets that support the cam-shaft casing are loosened. The rock-lever boxes, which form part of the cam-shaft casing, can then be hinged back clear of the valve-domes, which are then unscrewed to enable the valves to be lifted out complete with their cages. If a valve should break, special precautions have been taken to minimise the likelihood of damage resulting from the mishap. The valve-stems are turned down to two different diameters, the larger diameter extending «0 ® AlRSHI British Army Dirigible Out. A SERIES of trials were carried out with the new Army dirigible on Tuesday morning, and, in spite of the strong breeze and mist, several evolutions were success fully carried out. The airship described circular move ments over Farnborough Common, the altitude varying between 500 and 1,500 ft., and Capt. Carden and Lieut. Waterlow, who were in charge, twice brought it to the ground once or twice in order to test the landing lines. The engines worked well, and it is expected that a speed of 50 miles per hour will be obtained shortly. The Naval Dirigible, IN reply to questions in the House of Commons last week, Mr. McKenna said that the Admiralty had not erected any garage or shed for the dirigible which is being built at Barrow; but there was the garage there which belonged to Messrs. Vickers, Sons and Maxim. This had been built for the special purposes of the Admiralty, and it was hardly likely the Vickers-Maxim Company would turn them out. When experiments had been made with the new balloon they would see the precise kind of shed required for it, and the Admiralty would then be prepared to take the necessary steps. The Cesar ** Aeroplane-Mixte." A STRANGE craft was taken out at Issy for its initial trials on the nth inst. This was the Cesar "Aeroplane- Mixte," a tandem biplane, above which is mounted a cigar-shaped gas-bag of 100 cubic metres capacity. The motor is a 50-h.p. Prini-Berthand, and the trials are said to have surpassed all expectations, but up to the present no details are obtainable. " Col. Renard" Out Again. THE repairs and reconstruction being completed, the military dirigible, " Col. Renard," was given a five from the head of the valve for a distance of about an inch up the stem, where it abruptly changes to the smaller diameter. It is the smaller part of the valve- stem that fits the guide; the larger part of the valve- stem does not enter the guide at all, but it is surrounded by a sleeve forming an extension of the valve-cage casting. This sleeve projects down as close to the head of the valve as possible. If the valve-stem breaks it is probable that it will fracture in the smaller part of the stem, and it is therefore anticipated that the larger part of the stem will always remain intact with the head in the event of breakage, and on this assumption a very simple device has been introduced to prevent the head of the valve from falling into the cylinder. The valve- chambers are so situated that they very slightly overlap the walls of the cylinder, which causes a small ledge (Fig. 11) to be formed where the wall of the valve- chamber merges into the wall of the cylinder. It is this ledge that stops the valve falling into the cylinder in the event of a fractured stem, and it is the aforementioned sleeve on the valve-cage that renders the ledge effective for this purpose by guiding the thicker part of the valve- stem that by assumption has remained intact with the valve-head. But for this sleeve the valve-head would, of course, tilt sideways and in all probability succeed in „ slipping past the ledge. (To be concluded.) ® ® p NEWS. hours' trial trip on the 2nd inst. Starting from Beauval, the dirigible cruised above the military parade-ground for some time, and eventually made a wide circle over the surrounding country. "Parseval V Out for a Trip. ON the 1st inst. "Parseval V," the smallest of this type of airship yet built by Major Parseval, was given a long test, and flew from Bitterfeld to Tegel, traversing 75 miles in about 3^ hours. The balloon is 7,0 metres long and is of 1,200 cub. metres capacity. Lieut. SteMing was in charge, accompanied by one passenger and a mechanic, and on landing expressed his satisfaction with the behaviour of the new craft, and especially with regard to its elevating-gear. ** Clouth " Sails for Two Hours. ON the 1st inst. the dirigible " Clouth," which has been temporarily occupying the military airship shed at Bickerdorf, by Cologne, had to vacate those quarters. An ascent was therefore made with the vessel, and after cruising above the forest of Cologne for two hours, it landed at Nippes. On the 4th the gas was being trans ferred to an ordinary balloon, " Clouth V," when the latter was caught by a sudden gust of wind and blown away, eventually coming to earth in Belgium. Zeppelin Arctic Expedition. AT a meeting of the Zeppelin Arctic Expedition Committee presided over by H.R.H. Prince Henry of Prussia on the 5th inst., it was resolved to make a request to the German Government for the services of the Imperial exploration steamer "Poseidon" for 10 or n weeks. The members of the expedition intend to start for Spitzbergen on July 1st and will then by the aid uf the " Poseidon " study the conditions for airship landing. 15
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