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Aviation History
1937
1937 - 2317.PDF
AUGUST 19, 1937- . FLIGHT. ig5 large range of movement, and therefore requires less magnifica tion for a corresponding movement of the pointer or pointers. But without the two, or sometimes three, pointers, it would not be possible to see movements corresponding to less than 10 ft. of height. The dial circumference of an ordinary altimeter is about 10 in., and if the instrument is graduated to 10,000 ft. the scale allows one inch per 1,000 ft. But, considering only the long pointer of the Kollsmann altimeter, which measures only 1,000 ft. for a single circuit of the dial, it will be seen that this is 100 ft. per inch, so that readings can be taken ten times as accurately. The zero is set, not by movement of the scale, but by rotation of the three pointers, together with the centre of the dial. In the illustration of the panel the third pointer is behind the other two, but its length can be judged from the lettering just above the word "altitude," which says " 10,000 ft." This means 10,000 ft. per figured graduation; at 50,000 ft. the smallest pointer would be stand ing between 4 and 6. Rotation of the dial results in movement of a scale of milli metres of mercury against the mark which would normally be figured 5 on the height scale; the instrument can be set to the barometric height at the aerodrome on which the aircraft stands; or, disregarding the barometric reading, it can be set to zero at that ground level, and will then be useful for circuits and landings at low altitude. For blind landings it Another Pioneer Passes WITH the death in Paris on August 11 of Jean Louis Conncau, at the age of fifty-seven, one more link with the heroic days of flying has been broken. Under ±he name Andre Beaumont he won many famous air races during the 1911-1912 period, including the Circuit of Britain, in which he fought a ding-dong duel with his compatriot Jules Vedrines. Conneau's favoruite mount was the Bleriot monoplane, and it was in this type of machine that he won the Daily Mail's ;£ 10,000 prize in 1911. New Aviation Maps THE I.C.A.N, has agreed to undertake the publication of a standardised series of international aviation maps. The series includes a so-called International Local Aeronautical Map, which is intended for use " on journeys of moderate length." This country is responsible for the production of six sheets of this map, covering the greater part of Great Britain, and the task has been entrusted to the Ordnance Survey Office, would be set to the barometric height at the airport of arrival —as communicated to the pilot by radio. The reading, accu rate within a foot or two, will then show the exact height of the aircraft above the ground. The new blind-flying panel carries the six finest instruments of their kind in the world. It will at once be remarked that some of their indications overlap. But could any one of them be dispensed with ? Not the airspeed indicator, as no other instrument shows the speed; nor the Horizon, which alone gives true pitch free from gravitational errors, and true bank whatever the centri fugal force of a turn—indications vitally needed by a pilot taking off the deck of a carrier in the dark; not the rate-of- climb indicator, long used by American transport aircraft for its instant index of the best climb or safest glide; not the altimeter, showing gain or loss of height foot by foot vvaei.1. ;..n aircraft is staggering at its ceiling or landing upon an in visible aerodrome; nor the Directional Gyro, utterly free from lag or northerly turning error, and dead true in its measure ment of the amount of turn; and not the turn and bank indi cator, with the top pointer showing the best angle of bank to ensure freedom from sideslip, and the gyro pointer still in steady and accurate action when required at the end of a 5,000-ft. spin None could be dispensed with, and it is doubtful if any could have been bettered. Southampton. The first of the six sheets is now ready and will be on sale on Saturday next, August 21. The map is drawn on the modified polyconic projection to a scale of 1/1,000,000, and is based on the 1/1,000,000 international map of the world, each sheet of the British Section covering 6 degrees of longitude and 4 degrees of latitude. There is no overlap between adjacent sheets. The map differs in many respects from the more familiar Ordnance Survey quarter-inch and ten-mile maps of Great Britain, and a great deal of unnecessary detail has been omitted. The scale, about iG miles to the inch, is convenient for general navigation use, especially in view of the greatly increased cruising speeds of modern machines, and the map has the advantage of forming part of an international series. The first sheet, entitled "N.N.31 Amsterdam," covers an area extending between the meridians of o degrees and 6 de grees East longitude, and the parallels of 52 degrees and 56 degrees North latitude. The remaining five sheets should be ready in the course of the next few weeks. The price of these maps will be: Flat and unmounted, 2s. ; mounted, folded and waterproofed, 4s. 6d. They may be obtained direct from the Survev Office or through the usual agents. THE CULT OF THE INVER TED VEE: The Daimler-Benz and Junkers concerns have lately built inverted-vee liquid- cooled engines for new German military machines. Above is a D-B installation in a B.F.W.- 109 while the top right-hand view shows a similar machine with a Junkers. The twin- engined bomber is a Dornier Do. 17 with two Daimler-Benz engines
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