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1901.] MARINE REVIEW. 29 FUEL ECONOMY. Dearing Water Tube Boiler Co., Detroit, Mich. Gentlemen:--The boiler we purchased of you about three years ago has been in service now three seasons, and has given entire satisfaction. It is an easy steamer and very economical in fuel, and we can cheerfully recommend it to any one wishing a boiler. Yours very truly, THE CARL ANDERSON CO, General Machinist. October 31, 1899. The heating surface is so proportioned as to be at right angles to the heat rising from the grates. The heat is evenly distributed direct through the generating tubes, thus ensuring great fuel economy and a quick generation of steam. THE DEARING WATER TUBE BOILER is the most compact, most simple, most economical marine boiler made. Our catalog gives full particulars. Write for it. Dearing Water Tube Boiler Co., DE TROET, -MICEH: STANDARD SEAMLESS TUBE CO. MANUFACTURERS OF Seamless Cold Drawn Steel Tubing IN ALL SIZES FROM % TO 16" DIAMETER. Stay Tubes, Hollow Shafts, water Grats, | BOHM CL TUDES | Bestinss Compressed Air and FOR ALL CLASSES Hydraulic Tubes, High Steam Pressures. OF MARINE WORK. Ftc., Etc. NATIONAL TUBE COMPANY, SELLING AGENTS, SALES OFFICES: Havemeyer Building, New York. 95 Milk St., Boston. Conestoga Building, Pittsburg. 267 So. Fourth St., Philadelphia. Western Union Building, Chicago. 420 California St., San Francisco. London, E. C., Eng. FOREIGN OFFICE: Dock House, Billiter Street,