Rigid Storage Vessels for Coal-gas.
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There is a wide range of choice in the matter of gas-holders for use on commercial motors. Gas engineers i are of opinion that there s "nothing like leather," and buyers will probably agree that there has hitherto been nothing like the prices which are being asked for it. Leather is in favour., we know, amongst the men who live and move in the gas world, but there is ample evidence available, from the records of ballooning and dirigible-airship running, to show that proofed cotton fabrics are good enough. Especially should the proofed cotton fabric meet the case of commercial-motor needs, so far as any limitation due to leakage through the envelope affects them, by reason of the short period of time that any such gas-holder will be full. We have already had pleasure in furnishing the names of several important firms who proof cotton fabrics, for the guidance ofOinterested readers, and we may now add that Messrs. Andaew Barton Bros., of Beeston, Notts., the pioneers of as traction on common roads in conjunction with modern petrol engines (not overlooking the efforts by Mr. .Dunkley, of Birmingham, some .18 years ago), are also making experiments in conjunction with the Phoenix Supply Co., of 15, Hozier Lane, London, E. a., the experiments here concerning materials in which this wellknown supply company specializes. The Steel Barrel Co., Ltd., of Uxbridge; Middlesex, is in a position to supply gas-holders of the rigid type. This company, as is well known to supporters of THE COMMERCIAL Mama has an extensive and unique experience, in the manufacture of steel barrels, tank wagons, storage tanks and a great variety of welded containers. Its ability to combine strength with lightness in the products of its works is well testified by the special jobs which it has done. The company is in a position to quote for gas-holders of varying capacity. For example, we note that one tank, of about 90 cubic ft. eapacity at atmospheric pressure, and intended to hold nearly 1000 cubic ft. of gas after compression to 145-150 lb. on the sq. in., is quoted at 24 4s. ex the company's 13hcenix wharf at Uxbridge, with an estimated total weight of 151,cwt. This gas-holder is cylindrical in shape, with outwardly-dished ends, and the sections of the walls of the cylinders are not less than 15r in. in thickness, with the ends domed to a radius of approximately 28 ins. The works test is to 300 lb. on the sq. in. The price includes a screwdown stop-valve of 1 in. bore. Another type of gas-holder whicl this company is ready to supply ii specified as follows :—Horizonta tanks with convex ends, each 15 ins in external diameter, and 10 ft. lona outside, to withstand a workini pressure of 150 lb. on the sq. in., lx be tested to 250 lb. on the sq. in. to be made of sheet steel 9 B.G thick—i.e., metal weighing abou. 5-i lb. to the sq. ft. ; the bodies tc be made in two lengths and joinec round the centre by means of E butt-strap 18 ins, wide and If in thick we ded on ; the ends weldec in„ and made to a radius of gi ins. with rounded corners to about 1 in radius. These tanks are estimate( to weigh 265 lb. each, to which an other 7 lb. should be added for till in, screw-down stop-valve. Pric( net, including one valve, £12 lOs each ex works. The approximat( internal capacity of such a gas holder is 11.25 cubic ft.., and thre( of them would be required for thl volume of gas to replace one gallor of petrol.
The exact use of cylinders sucl as the foregoing must be deter mined by the size of any commercia lorry, but in some cases it might bl admissible to draw them on trailer. The company is prepare( to quote for welded tanks to an design, and the holders will be o highest quality.