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quipment Used Afloat and Ashore Motor Lifeboats All Welded Black Steel Zine Coated— A New Type of Radiator—New Pliable Wood Veneer SE of electric are welding in Jes building of smaller steel boats is of great interest to naval architects and shipowners. Un- doubtedly this type of construction will be widely used in the future. When the U. S. Grant, of the United States army transport serv- ice, required two motor lifeboats it was decided that they should be of all welded construction. Plans and specifications were prepared by the army transport service and the con- tract was placed With the Welin Davit & Boat Corp., Newark, N. J. This company had recently com- pleted 20 large steel lifeboats for the United States liner MANHATTAN which were very similar in size and shape to the proposed welded life- boats, though not of welded con- struction. The bureau of navigation and steamboat inspection approved the use of electric welding in the con- struction of the two motor lifeboats. They are 30 feet long, 9 feet wide and have a depth of 3 feet 9 inches and are certified for carrying {0 persons. The: keel is) 7a. sinzle length of 1 x 4 inches bar st:el, while the sternpost is built of two pieces of % x 4 inches bar steel bent around the stern tube and _ fillet welded. The hull is of 14 B.w.g. black sheet steel and is butt welded. All seams are backed, on the inside, with % x 1% inches steel straps which are tack welded to the hull. The garboard strakes, stem and stern shell plating are flanged to the keel, stem and sternpost and fillet welded both inside and out. It is in- teresting to note that no warping occurred during the welding. A watertight housing, made in two sections for convenience, covers the engine. The intercostals, of 12 gage B.w.g. steel, are tack welded. to floors and _ shell plating. All air tanks are removable for cleaning and painting. Those in the ends are of 18 B.w.g. galvanized sheet steel, while those on the sides are of 20 B.w.g. metal. After the hull was entirely plated it was thoroughly sandblasted and sprayed inside and out with molten zine. This coating was applied to a thickness of about three ounces per square foot of surface, except along the bilge line, stem and stern post where it was applied doubly or trebly thick. All metal surfaces were treated in the same manner, with the exception of small fittings which were galvanized by the usual method. The power unit is a Buffalo navy type 25 horsepower gasoline engine, with electric starter. On the test runs a speed of about 7 knots was ob- tained with the boats loaded to ca- pacity. Radiator for Marine Use NEW and distinctive type of radiator combining utility and attractive appearance has been de- veloped by the Shaw-Perkins Mfg. Co., Pittsburgh. It is the result of extensive research and many years of lexperience in the manufacture of radiation apparatus. The best ap- proved materials are used in its con- struction and it is designed in ac- cordance with the most modern en- gineering practice. The radiator has an extended sur- face steel structure in contact with an internal copper tube. All surfaces, including the exterior are joined in heat contact with the copper tube, making an efficient and rugged unit. Heat is conducted through the ex- tended steel surface from the copper tube which contains the heating medium, and is given off by convec- One of twe all welded motor lifeboats for Army Transport Service—Black steel butt welded—Zince sprayed after completion MARINE REVIEW—January, 1933 tion to the air which circulates through and over the radiator and also, by radiation, from the exterior surfaces. This radiator, therefore, supplies both convected and _ radi- ated heat and forms its own cabinet, grille and radiator, all in a single New Type Radiator for Marine Use integral unit. This is especially advantageous on shipboard where space is at a premium. The accom- panying illustration indicates its pleasing appearance. These radiators can be installed for one or two pipe steam and hot water heating systems. Ratings are based on heat emission of 240 B.t.u.’s per square foot per hour at 215 de- grees Fahr. steam and 70 degrees room temperature. These ratings are for condensation only with nothing added for heating effect. The manu- facturer is prepared to give the size and heat emission of radiators for various temperature conditions and for varying conditions of heating elements. An installation of this type of ra- diator was recently made in a large yacht. Its simplicity, ruggedness. efficiency and neat appearance sum te make this type particularly suit- able for installation in passenger ac- commodations on all types of ships. New Flexible Wood Veneer WATERPROOF, flexible, genu- A ine wood veneer wall covering, suitable for marine application has been developed by the United States Plywood Co., Inc., New York. The waterproofing of this material, which has been given the trade name, “Piexwood,’’ is accomplished by employing a waterproof adhesive for mounting thin wood veneer on fine cloth backing. The flexing process makes the veneer pliable and flat. 35