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April, 1924 MARINE REVIEW 19 Locking the stable after the horse is stolen Fig. 1 Condenser Tube which failed after 6 months service. Unsound metal. Magnified 75 Diameters REMATURE FAILURES of con- denser tubes can often be prevented by using modern methods of testing this material before it is installed. For example, a certain installation of con- denser tubing leaked so badly after being in operation only six months that it had to be replaced. A microscopic examination of the defective material showed the existence of large gas pockets below the surface of the metal. Refer to Fig. 1 (above) which is a micrograph of the longitudinal edge section of one of the defective tubes. The black horizontal line is the gas pocket. Compare this with Fig. 2 which rep- resents fine grained cup drawn tubing. Un- | Fig. 2 Scovill Fine Grained Cup Drawn Ad- miralty Con- denser Tub- ing. Magnified 7 5 Dineun soundness of the metal was responsible for this loss in service. Condenser tube users can be assured of a thoroughly tested product by specifying Scovill Cup Drawn Admiralty Tubes. Unsound ma- terial cannot creep into tubes made by the cupping process, because unsound metal can- not stand the transverse strain involved in transforming a thick sheet of wrought brass into a cup. The use of brass melted in electric furnaces, chemical analysis of each heat, and accurate control of the heat treatment result in a product made on an engineering basis and designed to give long uninterrupted service. Our tubing is subjected to the air, hydraulic, mercury, expansion and microscopic tests be- fore it is shipped to the customer. May we figure on your next installation? SCOVILL MANUFACTURING COMPANY Main Office, Mills and Factories—Waterbury, Conn. BRASS MILL PRODUCTS—MANUFACTURED GOODS TO ORDER Sales Offices 280 Broadway, New York 10 High St., Boston 1213 W. 3rd St., Cleveland 224 W. Lake St., Chicago Penna. Bldg., Philadelphia ESTABLISHED 1802 SCOVILL| MVNO Neg MU) cai Ten Ore) VPET-NN i Pacific Coast Sales Agent Engle-Reid Co. 149 California St., San Francisco Terminal Sales Bldg., Los Angeles SCOVILL CONDENSER TUBES Member, Copper and Erass Research Association Please mention MaArtNe REvIEW when writing to Advertisers