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"TAE Marine REVIEW 23, SEA GOING MOTOR LAUNCH. In Engineering of London. for Nov. 2, 1905, is described a sea going motor launch which was built by Messrs. Dickson & Halliday, of Southampton, England. The machinery was constructed by Messrs. Legros & Knowles, of Willesden Junc- tion, London. The principal dimensions of the boat are as follows: Length over all 30 ft.; Water line length 29 ft.; Extreme beam 6 ft.; Water line beam 5 ft. 8 in.; Depth amidships 3 ft. 8 in.; Freeboard, forward 3 ft.; Freeboard amidships 2 ft. I in.; Freeboard aft 2 ft. 2 in.; Extreme draught 2 ft.; Dis. placement with crew 2 tons; Area, midship section 4 sq. ft.; block coefficient .451; Prismatic coefficient .620; Barke horse power 24; Revolutions per minute 8oo. : In the design of the boat speed was a secondary considera- operates the mechanical make-and-break ignition device.. In addition to the mechanical ignition there is also a high tension -- ignition device provided for use in case of emergency. This was done in order to eliminate the chance of motor stop- page, due to ignition trouble in a seaway. The engine is provided with large bearing surfaces for the main bearing and crank-pins; the mean pressures on these are kept as low as in standard marine practice, and therefore far lower than is usually the case in petrol engines. The engine is extremely accessible. It is held to its bed plate by three lugs on each side in the form of hinge joints, which may be plainly seen underneath the cylinders in the illustra- tion. By means of these hinge joints it can be swung to. one side or the other to get at the big ends of the connecting rods or the main bearings. Two detachable inspection doors 7 i MARINE REVIEW MACHINERY OF SEA-GOING MOTOR LAUNCH. tion, the seagoing qualities, handiness being kept prominently in mind. The boat will accommodate ten persons, and provide ample storage space in the forward compartment. The hull is of pine planking 5% inch thick with teak top strake. The boat has for its entire length on the inside an American elm keel and an Oregon pine keel on the outside, which forms the principal girder of the boat's frame. It is carried from the stem to within 5 ft. of the stern. It is 3 in. thick through- | out and has a depth of {5 in. at the after end. * The boat is propelled bya petrol engine of the four-cylinder type. The cylinders are 434 in. diameter by 434 in. stroke. The engine is designed to develop 24 H. P. at 800 revolutions. .The inlet valves are mechanically operated and are situated in the cylinder head. They are driven by rocking levers in the same cam shaft that operates the exhaust valves. On the opposite of the engine there is a second cam shaft which are fitted to the base chamber and hand holes giving access to the main bearings. The cam shafts are held to their bear- ings by caps and these bearings can be removed from the rest of the engine without disturbing the cylinders or base chamber. The crank shaft-is also held up into the engine bed so that when the engine is swung on one side, and the oil bath casing removed, the big ends and main bearing are immediately accessible for adjustment. Fuel is supplied to the carburettor by gravity fon a 10 gallon tank in the fore compartment of the boat under the turtle deck. A second fuel tank of 21 gallons capacity is carried under the main thwart, and the fuel contained in this tank can be pumped into the, forward or running tank by a semi-rotary hand pump. By means of the design of the carburettor, which gives a positive mixture for every position of throttle opening, the engine will run and pull steadily at all speeds from 140 revolutions upwards. The torque is practi-