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for the sole use of cabin passengers. On D deck in the forward foyer -igs an attractive novelty shop, which now seems to be a necessary feature of a modern passenger ship. The central telephone control is lo- cated on E deck, off the forward foy- er. Adjacent is the chief steward’s office, the purser’s office for first- class passengers, and the freight clerk’s office. The cabin purser’s of- fice is aft, on D deck. A broadcasting system is installed which distributes entertainments or lectures given on shipboard as well as radio programs from shore. Mi- crophones can be installed in the main lounge and dance pavilion and at the captain’s table in the main din- ing saloon; loud speakers are in- stalled in all public spaces, on deck, and in private verandas and parlors and suites for use when desired. Machinery Installation ACHINERY of the MARIPOSA consists of high pressure, high temperature watertube boilers, sin- gle reduction geared turbines and electric auxiliaries. A twin-screw in- stallation, designed for 22,000 total shaft horsepower at 124 revolutions per minute of propellers in normal operation. In the boiler plant are twelve units in two fire rooms, arranged for forced draft with closed stoke hold. The boilers are of Babcock & Wilcox cross-drum marine type, fitted with inter-deck superheaters, tubular air heaters, soot blowers, food regula- tors, and smoke indicators. Each boil- er has four Cuyama oil burners. Total water heating surface is 53,520 square feet; total superheating sur- face is 5352 square feet; and total air Wheel House—Elaborate Nerve Center of the S. S. Mariposa Two duplex talking picture . sys- tems have been provided for the en- tertainment of the passengers. One is installed in the main lounge; the other in the cabin lounge. Deck covering throughout all pas- senger space, in public rooms, state- rooms, and corridors, and on stair- ways, is rubber tile, all supplied by the United States Rubber Co. Carpets and rugs are used in staterooms, foyers, public rooms, and elsewhere. A gymnasium for passengers is provided on the boat deck. It is com- pletely equipped including weights, rowing machines, medicine balls, box- ing gloves, punching bags, a mechan- ical horse, and other apparatus. The number of staterooms on board the MARrIposa is as follows: 266 first- class rooms accommodating 475 pas- sengers; 67 cabin-class rooms, ac- commodating 229 passengers. The seating capacity of the main dining saloon is 376 persons; and of the cabin “dining saloon, 134 persons. 24 heating surface is 32,112 square feet. The four centerline boilers are fitted with desuperheaters in the steam drum having a total surface of 180 square feet. The designed steam conditions at the superheated outlet are 375 pounds (gage) and 650 de- grees Fahr. total temperature. Air for combustion is provided by eight motor-driven fans, four in each fire room, of which two are spare. These fans draw the air through suc- tion ducts leading from the exposed deck and discharge it into the fire room. The air in the fire room en- ters the air heaters at the front of the boiler and passes through air cas- ing and around and under the boiler, and through a double front, to the oil burners. There are two double stacks, each serving six boilers. In each fire room there are two fuel oil service pumps, one of which is spare, a fuel oil transfer pump, and an emergency fuel oil service pump, and two fuel oil heaters, one MARINE REvIEw—February, 1932 of which is spare. There is also a complete installation of fuel oil strainers, fuel oil meters, CO, indi- eators, gas and air temperature ther- mometers, and gages, ete. The propellers are of solid man- ganese bronze,18 feet 0 inches in di- ameter and 19 feet 6 inches pitch, each having three blades; the blade sections are of streamline shape. The developed area is 105.8 square feet; the projected area, 88.7 square feet. Main Propelling Turbines Each set of turbines consists of three units of Bethlehem-Parsons turbines in series, arranged in sep- arate casings around a single gear wheel. The high pressure unit is an impluse-reaction turbine with dum- my piston just forward of the im- pulse wheel. The intermediate pres- sure unit is a straight reaction with dummy piston at the aft end. The low pressure unit is a double-flow straight reaction turbine. The astern unit, located in the forward end of the low pressure casing consists of two impulse stages, with three rows of rotor buckets in the first stage and two rows of rotor buckets in the second stage. All ahead turbines have rotors of drum construction. The steam conditions at the tur- bine throttle valve are 360 pounds (gage) and 650 degrees Fahr. total temperature. The vacuum at the low pressure turbine exhaust flange is 28.5 inches. There are 29 nozzles in the lower half of the high pressure chest, 15 of which are under control of the turbine throttle valve and the re- mainder in three groups of 2, 4, and 8 nozzles, respectively, controlled by hand valves. Overspeed governors are provided which function as follows: An im- peller on the forward end of the high pressure turbine shaft discharges lu- bricating oil to an adjustable spring- loaded valve which serves to actuate a pilot valve, which in turn controls the flow of oil (under lubricating oil pump discharge pressure) to and from an operating cylinder closing the main ahead throttle valve. The single reduction gearing is of the double helical type, manufactured by the Falk Corp, and the main pro- portions are as follows: Pitch diam- eter, gear wheel, 156 inches; pitch diameter, pinions, 12.25 inches; net face, 56 inches. The propeller thrust is taken by a 34-inch nominal diameter double horizontal, self-aligning, equalizing, six-shoe Kingsbury thrust bearing, incorporated in the forward end of the gear casing. Three-shoe bearings of the same type, with a nominal di- ameter of 13% inches are fitted on the forward end of each turbine shaft. Located outboard of the low pres- sure turbines and connected thereto by double exhaust trunks _are -two