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1900. ] MARINE REVIEW. aay UCU Shelby Cold Drawn Seamless Steel Boiler Tubes are made from the very best quality of open hearth steel and are worked cold after the heating operations. This method of manufacture pro- duces a tube ABSOLUTELY FLAWLESS. Shelby Boiler Tubes contain no laps, seams, or blow holes and are very dense, tough and ductile. No dirt rolled into surface as will | frequently be found in lapwelded tubes. Shelby Boiler Tubes do not crack nor fail at the ends. Shelby Tubes do not leak. Cold Drawn Seamless Steel Tubing is specified by the U. S. Government for all U. S. Navy Boilers. Write for new catalogue for full information. eoese GENERAL SALES OFFICE~ ~ AMERICAN TRUST BLDG. BRANCH IAN L.YALE & CO. 8 ee * CHIEASS i o Baten? BLD'G a Si, 138 LAKE ST; Boe. ee J. LYNN PORT HURON, MICH." eG eigen e. grate Wie este SSL . wee eae ee bebe iss .