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Some of the Products of the Gray Motor Co., The Clifton Motor Works and the Remington Oil Engine Co. Doing Service That Could Not Possibly Be Done by Steam Without Great Waste --The Field of the Internal Com- bustion Engine is a Growing One and Has, in Fact, Under- gone Exceptional Development in the Past Few Years. N unusually large gasoline-driven boat, which is named the Radium, was recently built by the Skinner Ship Building & Dry Dock Co., Balti- more, Md., and is now in the service of the Gulf Refining Co. Her dimen- sions are 153 ft. length over all, 23 ft. 10 in: beam and 12 ft. 6 in. depth. The vessel is built of steel through- out with the exception of the upper deck house, which is of wood and in- cludes the pilot house, captain's room and cook's room. The lower house is of steel and includes the upper en- gine room, the entrance to the pump room, storeroom, engineer's room, deck hands' quarters and galley. All of these quarters are located in the after part of the vessel and are well lighted and _ ventilated. In the hull of the vessel there are five main transverse bulkheads and one vertical fore-and-aft bulkhead, all made oiltight andaéproviding eight com- partments for cargo oil. The cargo oil is pumped from these compart- ments by feur Gould 'Pyramid' pumps, 6 in. by 12 in., located in the upper engine room and connected by belt to a 20-H. P. horizontal gasoline (petrol) engine. These pumps can be arranged to be thrown in or out of gear by Orton clutches worked by levers. The suction and discharge of these pumps is 4 in. in diameter, and all valves in the cargo lines are 4 in. iron body brass-trimmed flanged gate valves. The Radium has a displacement of 750 tons and on her trial trip, loaded, showed a speed of 8.4 knots. She has a fuel capacity sufficient for a radius of 1,800 nautical miles. The propelling machinery consists of a standard air- starting and reversing single- -acting gasoline (petrol) engine rated by the manufacturers, the Standard Motor Construction Co., Jersey City, N.:J., as a 300 H. P. size, but which has been found capable of developing con- siderably greater horsepower. Two fuel tanks are located under the cargo pump space, having a capacity of 6,966 gallons. There is also a cylindrical tank in the engine room of 1,124 gallons capacity and a small tank for the pumping engine of 53 gallons. The total capacity of fuel tanks is, They Are Now Doing Satisfactory Duty in all Parts of the United Sia --The Radium Equipped With Stand. ard Motor--The Natilie and the Hard and Constant Work Which She is Doing in Breakwater Construction at Cape May--The Reliability of the Standard Motor -- The Illustrations Herewith Show Some Ugly Looking Craft, but for efficiency in Their Special Service They Cannot be Surpassed. therefore, 68,143 gallons, Two air tanks, 18 in. in diameter by 8 ft. long, with a total capacity of 27.4 cu. tt, are located under the main deck in the engine room for supplying air for starting and reversing the main engine and fot auxiliary purposes. In the after end of the engine room there is a fresh water tank of 507 gallons for supplying the galley. The vessel is lighted bya 2-K. W., 7%-H. 2 Standard gasoline auxiliary engine, at- tached to which is a bilge pump and air compressor. Natilie The work which the Natilie, owned by the Breakwater Co. of Philadelphia,. is called upon to do is probably the hardest that has ever been given to a power boat. This is in connectioa with the building of a jetty at Cape May, N. J. The Natilie runs from Cape May to near the _ breakwater and picks up 150-ft. barges laden with stone and tows them through the breakers and into shallow water, where they can be dumped. While doing this work the boat is often NIOBRARA & SOUTH DAKOTA FERRY BOAT, EQUIPPED WITH GRAY MOTOR LAUNCH GRAPHITE, EQUIPPED WITH MOTOR