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S. S. TENASSERIM. the stem down to the forefoot, -and just prior to the removal of the sev- ered portion by the:crane, and the Other after this removal had taken piace' The total: length of . cutting was about 90 ft. Single plates were 14 in. thick, and, of course, double thickness was encountered where they overlapped at the landings. The stem bar was broken through at the top, where the cutting commenced, but was intact' at the bottom, and the total thickness to be cut through there including the plates on each side of the stem was 5% in. The workman entrusted with the job by the Oxygen Co. completed the task 'as. has been said in about 1% days, but had the weather conditions not been so unfavorable, and had he been more accustomed to working on scaf- S. S. TENASSERIM, THE Marine REVIEW folding, the task could have been ac- complished well within one day. The hand cutter used on the work is of the blow pipe pattern introduc- -ed originally in 1904 by the Societe Anonyme L'Oxhydrique International of Belgium, in which the extra sup- ply of oxygen--following upon the mixture of oxygen and _ acetylene, which heats to incandescence the metal being acted upon--effecting ac- tual severance, is supplied through one nozzle. Another form of cutting instrument, as is well known has sep- arate nozzles, one projecting the flame of mixed gases, and the other placed immediately behind the flame, pro- jceting the extra and independent ox- ygen which effects the actual cutting. The heating arrangement in the cut- ter under notice is on the injector principle, the oxygen alone being sup- plied under pressure; the fuel gas is drawn into the cylinddical mixing chamber, and it passes along with the oxygen along the tube and _ out through the 'nozzle. "The two: gases enter the apparatus side by side at coe eG. ' cove Oxy-AcETYLENE BLtow' Prpr.. CUTTER. the inlets to the left of the chamber, and are separately adjusted 'by means of two cocks or valves. The two mixed gases discharge through an an- nular opening in the end. of the noz- zle. The oxygen which is used for cutting issues through a separate pas- sage in the center of the nozzle, and is controlled by a thumb lever valve on the top of the chamber portion of the apparatus. The adjusted sliding guide shown at the side of the nozzle may be attached thereto to maintain a uniform distance between the cutter and the work, And also to insure steadiness when the cutter is in oper- ation, but this adjunct was not re- quired.in the case of the work of the Tenasserim's stem. In the engraving of the cutting tool @ and L are the attachments for the supply of oxygen and acetylene: © and valves by which these gases may be separately controlled; D-annular passage through which the mixed gases are discharg- ed; P the thumb. lever for regulating the jet of oxygen for cutting; C the passage through 'which the jet of ox- ygen for cutting is discharged; and A an adjustable sliding guide which can be attached to the cutter head at B, i -order to' mamtain a uniform ~December, 1909 distance between the cutter and the work, and to insure steadiness when the cutter is in operation. Oxygen and dissolved acetylene compressed in cylinders were employed, the cyl- inders lying at the bottom of the graving dock, the supply of gases be- ing carried to the cutter by suitable lengths of tubing. In the carrying out of the work, the Oxygen Co.'s operator was under the instructions of Messrs. D.. & W. Henderson & Co., and it is concéded by them that had the work been carried through by the ordinary method of hand cut- ting, it would have taken 10 men about two days to finish it. FAST SINGLE-HANDED STEAM LAUNCH. We are able to reproduce two in- teresting pictures of a remarkable steam launch which has been built to the order of Leonard Williamson, of Southport, for use on Lake Win- dermere. That a steamboat with ma- chinery of 140 H. P. could be capable of being entirely handled by a single man would seem, on the face of it, to be impracticable, but this result has been achieved by Messrs. Simp- son, Strickland -& Co,, Ltd, the well- known launch builders of Dartmouth. It is also a matter of satisfaction that she has turned out all that was de- sired « by. 'her owner. -.She is 38 ft, in, deneth by 6 4t. beam, andi: 3 tt 9 in. deep. Built of galvanized steel, and weighing complete, with machin- ery on board just over 4 tons, the boat is arranged with. a large - tur- tle deck forward, extending right ait over the boiler, and covering: the fuel tanks; aft of this is the machin- ery space and then comes a large comfortably fitted well carrying about 10 people. In order to make the boat capable of being handled by a_ single man, coal firing--was of course out of the question, and a special type of two drum water tube boiler is employed, designed by the builders, fired by means of two large oil burners, built by the Lune Valley Engineering Co., of Lancaster, which have proved very satisfactory in giving complete con- trol and supply of steam. The engines consist of the makers' very light four crank quadruple-ex- pansion machinery, giving 1401. H.P. at 1100. Roe with 330° Ibs: of steam and having cylinders 37% in, 5% in., 7% in. and 11 in. in diameter by 4% in. stroke and weighing 9 cwt. Nickel steel enters: largely into the construction of the moving parts and piston valves are used ample Si Ra ine shy A a