1862 London Exhibition: Catalogue: Class VIII.: R. Morrison and Co
1936. MORRISON, ROBERT and Co., Ouse-burn Engine Works, Newcastle-on-Tyne.
High-pressure surface condensing expansive marine engine, cut-off variable.
The above engraving shows a side and front elevation of these engines. The cylinders are inverted, and with the slide chest are completely surrounded with steam. There is an ordinary and expansive slide to each cylinder, each worked direct by a single eccentric. The two main eccentrics are connected together, and are loose on the shaft, being retained in their proper positions, for going a-head or a-stern, by stops bolted to the shaft. The two expansive eccentrics are also joined together, and are loose on the connecting parts of the main eccentrics, and also provided with proper stops.
Starting and reversing the engines are effected by means of a small additional valve, introduced expressly for that purpose. There is an air pump on one side, and a cold water pump on the other side of the eccentric gear, worked direct from the piston; these pumps are both single acting. There arc two supports to the cylinders on the starting side, but only one, which reaches nearly the whole length of the cylinders, on the other; in the latter are placed the tubes for the surface condenser. There is a door at the back by which to reach them, to replace or clean them. The remainder of the back support, the foundation plate, and the two front supports, all communicate together, and form a hot well to contain the distilled water pumped in by the air pump. The feed and bilge pumps are joined in front to the foundation plate, and are of the ordinary construction. These engines are intended to work at about 60 lbs. pressure above the atmosphere, and to expand from 6 to 8 times. There is a small wheel on the top of the slide chest, by turning which, the amount of expansion may be varied. This engine, though of 30- horse nominal power, stands on a space of 5 ft. 6 in. by 4 ft. The diameter of each cylinder is 18 in. and the stroke 18 in.