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October, 1913 SECTION AND DECK PLAN OF MOTOR LIGHTSHIP cooling is not necessary, but the three compressor stages, however, are each separately water-jacketed and provided with 'tween coolers. The valve cams are mounted on the horizontal shaft which is driven from the crankshaft through a vertical shaft by helical gearing. The main fuel pumps are also driven from the shaft and are mounted on the compressor jackets at the starboard side of the forward end of the engine. All cylinders are provided with forced lubrication supplied by the Piston-type pump, which is driven by an eccentric on the shaft, the oil be- ing supplied from a small reservoir through sight-feed controls. Forced lubrication is also provided for all bearings and gudgeon pins by a gear- Pump placed on the forward end of the engines, the oil passing through a cooler and a filter before reaching the pump. Sea water is used through- out for cooling purposes, the cooling Pumps being driven by the main en- gine. The gear pump mounted on the forward end of the engine is used for Cooling the pistons, and the other, a Plunger pump seen on the starboard Side of the air pump, is for the cool- ing of the working and compressor THE MARINE REVIEW s / \ cylinders. The latter pump is com- bined with the bilge pump and both are driven by balance levers from the air pump crosshead. For cooling the 355 ELBE I pistons the water is led through tele- scopic pipes, without stuffing boxes, the water entering the piston in the form of a free jet. ELECIRICALLY-OPERATED GERMAN LIGHTSHIP ELBE I