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"THE Marine Review 71 main deck, and kitchen on the dome deck, is covered with galvanized iron, fastened directly to the wood. Steel decks are fitted over boiler compart- ment, coal bunkers and engine com- partment. The engine room and boiler room ventilators and enclosures are of steel extending through top of dome. Two fire bulkheads are provided, extending from the main deck through all decks to the dome, dividing the vessel into three fire compartments. These bulkheads are of double thick- ness 7-in. tongue and grooved wood, cross-planked: diagonally and lined on both sides with Sackett plaster wall board covered with galvanized iron. Suitable sliding doors are provided in the main corridors and _ freight space. An iron bulkhead extending entirely across the upper deck house, is fitted just forward of the kitchen range. There are 65 hydrants located throughout the steamer, connected by copper fire mains with the fire and wrecking pumps, a 50-ft. length of STEAMER COMMONWEALTH ENGINE Room. hose is coupled to each hydrant and the location is such that all portions of the steamer are protected. Port- able hose are also carried by both engine and deck departments, and 37 fire extinguishers are located in con- venient places. Fire Fighting Equipment. In addition to this an independent sprinkler is provided, with 1,800 au- tomatic Grinnell heads, distributed throughout the interior of the steam- er, staterooms, and lockers, not ex- ceeding 8 ft. from center to center in any place. This system is divided into 30 circuits, each with a 4-in. diameter main from a manifold lo- cated in the engine room on the main deck. To this manifold the main discharge from a 16-in. by 12- in. x 12-in.duplex sprinkler pump is connected. This pump at alltimes main- tains a pressure at the manifold of 100 Ibs. per sq. in. and is fitted with a governor to maintain this pressure in case of the opening of any of the sprinklers, and is also circuits and fitted with a throttle by-pass which can be operated from the main en- gine room, Supplementary to this system is a thermostat system with mercury ther- mostats located not over 12 ft. centers with all wires run in conduit, and divided into circuits corresponding with the sprinkler circuits. This system ter- minates at two annunciators, one in the main saloon and one in the engine room indicating the circuit number. The opening of a valve of correspond- ing number on _ the sprinkler system manifold supplies water to the sprink- lers at the fire. In addition to the two main annun- ciators on the thermostat system, small annunciators are located throughout the saloons to determine the location of a fire within a range of a few state- rooms. All the annunciator drops, be- sides showing the circuit number, in- dicate the location on the steamer and ring 8-in. alarm bells located in the crew's .qarters, engine room and saloons. This system deviates to some extent from the systems in use on land. The