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September, 1912 ions amidships well above the wires and is flanked on both sides by little deck houses which protect the port and starboard engines. The crew consists of four men, including the pilot. The gasoline tanks are placed on top of the houses over the engines. It was the desire of the railway company to have a boat of as light draught as pos- sible and of low freeboard, so as to get the weights as low as possible. This necessitated a very shallow hull and in order to get requisite fore and aft strength, the designer worked out a pair of bridge girders, the bottom mem- THE MARINE KEVIEW weight from 7% to 12% lbs. The track is carried on two heavy yellow pine stringers bolted through the deck and supported transversely under each of the vertical struts of the bridge girder by channel beams so that the weight of the cars is transmitted directly to the bridge girder instead of to the hull proper. The usual river type of bridge at the ends was used and the ends of the hull designed to conform with this river type of bridge. Bilge pumps are provided on each of the main motors and also air pumps for the whistle. An independent centrif- 299 boat is fully equipped to meet govern- ment requirements for a boat of this size and purpose. The car ferry was built by the Du- buque Iron Works, Dubuque, Ia., and a trial run was made of the journey from Dubuque to Evansville. The car ferry made an average of 8 miles an hour, and during the last 48 hours of the journey the engines were not stopped for a single second. The White Star Line has decided to make extensive alterations in the Olym- pic as a result of Lord Mersey's recom- Deck ber of which was on the bottom of the hull and the upper members above the deck, the hull plating being secondary to these bridge girders and to supple- ment them. In fact the boat prac- tically amounts to a pair of bridge girders plated up so as to give sufficient displacement to carry the load and be seaworthy for river service. Four water- tight bulkheads were used dividing the hull into five compartments so that the boat would be floatable with any one of the middle compartments or both end compartments open to the sea. The entire construction except the houses covering the engines and _ the pilot house is built of steel varying in View oF Car Ferry HENDERSON, LOOKING ugal pump, 3 in., is connected to the flywheel at one of the main motors through clutch and silent chain drive. This pump is designed for fire and bilge purposes and so connected that water can be drawn from each of the watertight compartments of the hull and discharged overboard or can be drawn from overboard and discharged through the fire hose. Each pump has a capacity to supply 150 gals. per minute under the pressure of 200 lbs. The boat is equipped with double rud- ders and steering wheels after the usual ferry boat type and a searchlight is also provided on top of the pilot house for use when making landings. The AFT mendations. As soon as she is: with- drawn from regular service this fall she will be sent to Belfast and sub- divided longitudinally. Her present bulk- heads are wholly transverse and the ef- fect of the alterations, coupled with a water-tight deck carried well above the water line, will virtually make a double ship of her, The Boston Iron & Metal Co., of Baltimore, which purchased the troop- ship Yosemite from the navy depart- ment last spring, have decided to break her up.