The Artizan . ituted in the above equation, give H = 0-158. Thus the requiredmanometric height sought is 158ft. If we had used the more simple formula (511), P = 48-073 tf2 -v/ H, we should have H = •72 (48-073)2 (-19)4 1627. 515. A gasometer discharges 9-8109 cubic feet of illuminating gas per second,under a charge represented by a column of water 147ft. Required the size of theorifice to be made in the side of the gasometer to produce this flow. The baro-meter in this locality is usually at 2477 feet, and the thermometer at 59°. We have then 6 = 2477ft., and T = P06; moreover Q = 98109 cubic
The Artizan . ituted in the above equation, give H = 0-158. Thus the requiredmanometric height sought is 158ft. If we had used the more simple formula (511), P = 48-073 tf2 -v/ H, we should have H = •72 (48-073)2 (-19)4 1627. 515. A gasometer discharges 9-8109 cubic feet of illuminating gas per second,under a charge represented by a column of water 147ft. Required the size of theorifice to be made in the side of the gasometer to produce this flow. The baro-meter in this locality is usually at 2477 feet, and the thermometer at 59°. We have then 6 = 2477ft., and T = P06; moreover Q = 98109 cubic feetper second; and a manometric column of water of 147ft. is equivalent to one ofmercury of 147 jg^- = 010808ft. = H. The specific weight of illuminating gas (carburetted hydrogen) is, according toBerzelius and Dulong, -559 = p. The gasometer being made of copper sheets,the orifice will be made in a thin side, and the corresponding value of m = 065. The general equation (508 and 512) gives here S = 9-8109. 1296 x -65 x V7 = -1283. 010808 + 1-C Thus the required orifice will have a surface of 1283 square feet, or a squarewith its sides equal to 358 feet,—or if circular, 403 feet diameter. (To he continued?) BRITISH ASSOCIATION FOR THE ADVANCEMENTOE SCIENCE. Thirty-First Annuax Meeting, held at Manchester, Sept., FAIRBAIRN, Esq., , , , President. Section G (Mechanical Science).REPORT OF THE COMMITTEE ON STEAMSHIP PERFORMANCE. At the meeting of the British Association, held at Oxford in June, 1860, theCommittee was re-appointed in the following terms :— That the Committee on Steamship Performance be re-appointed to reportproceedings to the next meeting. That the attention of the Committee be also directed to the obtaining ofinformation respecting the performance of vessels under sail, with a view tocomparing the results of the two powers of wind and steam, in order to theirmost effective and economical combination. That the sum of £150 be place
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