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24 TARE MARINE REVIEW ' © 9 Con 1 I ; ce | a . ae | ! RAKE OF TRANSOM 4°IN '5 FEET ------ -- Ss | ao he o eee cece | fi: os | ioe ee -- ------ SS aa eS ee eo ( ' , ---------- the range. Water circulation through the engine is maintained by a centrifugal pump which is carried low down forward = : crank shaft by a roller pin. The water is delivered first to a water- pooled exhaust pot Carried close to the exhaust out- let, and from these proceeds to the engine jackets, and after- wards to the outlet of the boat. The engine valves are of large diameter and are made from 25 per cent nickel steel. The crank shaft is of chrome-vana- dium steel forging. The power is taken from the engine through a leather faced cone clutch, which is engaged by an adjustable coil spring and disengaged by a pedal. This clutch transmits the power to a small gear box giving a forward and reverse gear by means of three mitre bevels and sliding sleeve with dogs, which enables the two shafts to be dogged to- gether, or the power transmitted through the mitre wheels. The power is transmitted. through the bevel wheels only when running astern. The gear box forms an oil tight case in which the beveled gears run, and which also lubricates the © large phosphor bronze bearings. The box also has a plat- cally constant throughout and driven direct from the ; SEA-GOING MOTOR LAUNCH. form cast on it to which is fixed a cast iron steering and con- trol column. On this is mounted a vertical marine steering wheel, and in a convenient position for the steersman's right hand are two small handles controling respectively the throttle ' of the carburettor and the forward and reverse mechanism. The starting gear is also carried on the column. The after end of the engine housings forms an instrument -board upon which is placed a pump-lubricator. This is driven from a worm on the commutator spindle and delivers lubri- cant in quantities proportional to the speed of the engine. The two switches for magneto and high tension ignition, the in- duction coil fer the latter and the advance for both ignitions are also placed on this board. After the engine has started the : ignition may be advanced and left without further adjustment during the run. This enables the whole control of the boat to be managed by one man at the steering column, who can restart the motor with great facility without removing from his place. The engine is placed on its bearers with the crank center line horizontal so that the oil in the bottom half of the crank case may be equally distributed to the forward and after pairs of cylinders. This necessitates a Hooke's joint be- hind the gear box to connect with the tail shaft. The joint is made with the center line of both pairs of pins at the same plane, the pins being of~nickel steel and run in phosphor