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Aviation History
1910
1910 - 0718.PDF
t/u GHT responsible for the abandonment of this class of test now that it has served its purpose, I heartily welcome the transference of such an excellent nucleus of organisation to the field of aerial motoring, which calls for all manner of ably-directed effort in every country in the world. Certainly it would be remarkable if, in the near future, Ireland does not take a very prominent part in the grand work. Indeed, I shall be surprised if next year she does not hold a point-to-point aeroplane race, as, for example, between Dublin and Belfast, or the other way about. At Leopards- town all the officials of the Aero Club of Ireland worked each in his -capacity to the best of his ability to ensure success. The Com- SEFTEMBER 3, 1910. mittee of Management consisted of Mr. John Dunville, chairman of the Club, Major Wellesle'y, Mr. James C. Percy, and Mr. Edward White, Honorary Secretary of the Club ; the President being the Earl of Mayo, and the Vice-President Sir H. G. Bellew. The members of the Committee, besides those already named, are Messrs. J. T. C. Moore-Brabazon, Harry G. Ferguson, R. F. H. White, Wickham H. B. Moorhead, J. M. Davies, Goodwin B. Swifte, G. Hutton, S. Wilson, A. E. Porte, F. F. C. Trench, D. O'B. Gill, J. B. Dunlop, junr., R. J. Mecredy, Major Crook- shank, and Sir John Nutting, the Honorary Treasurer being Mr. Walter Sexton. The ROZ/CLL &ero Clu of the UixitecL Ktr\gdo OFFICIAL MOTICE.5 TO NE.MBE.RS Rolls Memorial Library. Mr. Frank Hedges Butler has presented to the " Rolls Memorial Library" Tumor's "Astra Castra" and "The Report of the Advisory Committee for Aeronautics." Committee Meeting. The next Committee Meeting will be held on Tuesday, the 6th September, 1910. Gordon-Bennett Aviation Cup. The date for the International Race for the Gordon-Bennett Aviation Cup has been fixed for October 29th, 1910, at Belmont Park, New York. Rolls Memorial Fund. Subscriptions of 10.?. have been received from the following members up to Wednesday, August 31st, 1910: — Dr. J. J. Acworth. R. G. Alford. Hugh Andrews, D.L., J.P. Harold Arkwright. Hart O. Berg, lohn Biekerstaffe. Alfred Bird, M.P. Bertram Blount. G. H. K. Bone. H. Percy Boulnois. Chas. W. H. Braun. Marshall Bruce-Williams. Ernest C. Bucknall. Alan H. Burgoyne, M.P. F. Hedges Butler. Griffith Brewer. Col. J. E. Capper, C.B., R.E. Capt. A. D. Carden, R.E. A. S. B. Chapman. R. L. Charteris. S. F. Cody. G. H. Colt. Capt. B. D. Corbet. W. J. Crampton. Claud Crompton. Sir Claude Champion de Cres- pigny, Bart. J. D. Denham-Smith. Sir A. Conan Doyle. Mrs. Duckham. S. F. Edge. H. M. Edmunds. S. Z. de Ferranti. A. E. George. Mrs. Granger. Major F. Egerton Green. Capt. Harold P. Green. Capt. A. H. W. Grubb, D.S.O., R.E. Capt. P. S. Harland. Dr. H. S. Hele-Shaw. Claude Johnson. Henry Johnson. C. B. Krabbe. Mrs. A. M. Krabbe. David H. Kyd. Robertson Lawson. W. J. Leonard. Henry D. Lewis. Eric R. Loder. Sir Hiram S. Maxim. F. A. Maythorn. W. N. McClean. Alfred Mond, M.P. Mr. and Mrs. Moore-Brabazon. Sir Charles W. Morrison-Bell, Bart. Auguste Oddenino. Percy Ogden. Phil. Paddon. Sir Richard A. S. Paget, Bart. W. J. Peall. Walter F. Pease. Mrs. Leigh Pemberton. Percy Leigh Pemberton. Ernest Pitman. W. H. Player. H. E. Robson Roose. Major-Gen. R. M. Ruck,R.E. H. L. Searle. Admiral of the Fleet Sir E. H. Seymour, G.C.B. C. E. Shepheard. E. Shrapnell Smith. A. M. Signer. Frank Souter. Stanley Spooner. F. Harold Sully. Hon. Arthur Stanley, M.P. Mrs. E. M. Styan. Alan J. Sykes, M. P., D. L., J. P. Arthur Sykes. Thomas J. Taylor. J. L. Travers. Charles C. Turner. S. Twining. A. H. Vincent. E. W. Wakefield. R. A. Wall. C. W. Wallace. P. Waterhouse. Norman F. Wells. Oswald H. Wells. Samuel White. W. Charles Whitham. E. T. Willows. Thomas Winch. J. W. Wood. Howard T. Wright. Hon. Mrs. Walter Paton, $s. Report on Barograph used by Mr. J. Armstrong Drexel, at Lanark on August 11th, 1910. National Physical Laboratory, Teddington. The barograph submitted for test by the Royal Aero Club marked Short Brothers, aeronautical engineers, and stated on the label annexed to have been used by Mr. Drexel on August nth, 1910, has been compared with the standard instruments of the National Physical Laboratory, and the percentage error of reading over the portion of the scale used has been found to be inappreciable. Corrections of - 1 mm. at the lower level and + 2 mm. at the upper were found, but these are less than the error of reading. It appears from the chart sent with the instrument and from these tests that the pressure at the start was 741 mm. of mercury, and that at the highest point reached 582 mm. of mercury. The difference in altitude which corresponds to these readings depends on the average temperature of the air column between the two points of observation and our information does not inolude this. It is also affected by the humidity. Accordingly, application was made to the Meteorological Office for the most probable values of temperature and humidity, and their report is appended. Assuming as the best values of pressure 741 mm. and 582 mm., with a mean air-temperature of Il°C, and the most probable value for the humidity, the altitude reached works out at 6,621 ft. If the uncorrected values of the aneroid are used—and the corrections are too small to be determined with certainty—the value is 6,752 ft. Copy of Report received prom the Meteorological Office. The following results have been obtained from the International Meteorological Tables, Chapter IV, Table IX. In order to apply the table it is necessary to make some assump tion as to the temperature. The Meteorological Office evening reports show that 160 C. = 6o-8° F. may be taken as the tempera ture value at the surface without great error. The approximate height of the ascent is 2,000 m. Adopting the usual temperature gradient o-5° C. per loom., we get 6° C. as the temperature at the top of the column. This gives (16 + 6)^ — 11° C. as the mean temperature of the air column. We can now apply Table IX of Chapter IV of the International Tables. H0= 742 mm. H = 580 mm. Z = 2,051 m. 6 = ii° C. = 6,729 ft. Applying the instrumental correction determined at N.P.L. H0= 741 mm. H = 582 mm. Z = 2,010 m. 6 = II° C. = 6,595 ft. If we apply a correction for humidity (for which we have to assume probable values) and for the variation of gravity with altitude, as given in Tables IX, B, C, D, we get the following values :— H0= 742 mm. H = 580 mm. e - u° C. H0= 741 mm. H = 582 mm. B = 11° C. 2,058 m. 6,752 ft. Z = 2,018 m. = 6,621 ft. An error of i° C. in the assumed temperature of the air column introduces an error of 22 ft. in the calculated height. Z gives the height above the ground, not that above sea level. August 17th, 1910. (Signed) R. G. K. LEMPFRRT. August 18th, 1910. (Signed) R. T. GLAZEBROOK, Director. 7l6
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