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STROMBOS SUPERPOWERFUL MARINE SIGNALS Operate on 10 to 100 Ibs. air pressure. Made of Brass and Bronze in 15 Models and tones. PENETRATE AND DOMINATE ALL NOISES. Heard from SIX to EIGHT MILES. Require 1/10 the air used in all other signals, pro- ducing greater volume of tone. Nothing inside to get out of order—No moving parts, repairs or attention required. BEWARE OF INFERIOR STROMBOS SIGNALS ON THE MARKET. AMERICAN STROMBOS COMPANY, Inc. 18th AND MARKET STS. : PHILADELPHIA, PA. Valuable territory open to Dealers W. & J. TIEBOUT W.H.MORETON CORP., MARINE EQUIPMENT & SUPPLY CO., 118 Chambers St., 780 Commonwealth Ave. 116 Walnut St., New York City Boston, Mass. Phila., Pa. 857% MAGNESIA PIPE AND BOILER COVERINGS OMe BRINE AND AMMONIA INSULATION, ETC. Taleetipesmdii ae tiegy Merah ese he Pa a c : i tan wprent i accepted hg standard throughout the marine world. IMMEDIATE DELIVERY AND SERVICE Persist ecuipment mcludes the fol- lowing: Feed Water Heaters, Oil Heaters, Oil Coolers, Feed W; Fil d P. S. THORSEN & Co., INC. Gree Gretel hon Ecaporiters, Disal- lers, Steam Traps, Exhaust Gas, Steam or INSULATION ENGINEERS AND CONTRACTORS Hot Water Generators—for Diesel Plants, 81 COFFEY ST BROOKLYN, N. Y. and Rand System for Heating Bunker Oil. : t Write for our interesting catalog. PHONE HENRY 3081-3082 DAVIS ENGINEERING CORP. 90 West St. New York City Factory: Elizabeth, N. J. Cap’n Allswell says: ‘‘Makin’ good propellers is a matter o’ havin’ done it a lot!’’ Write for ‘‘Propellers in a Nut Shell’’ Columbian Bronze Corporation, 238 North Main St., Freeport, L. I., N.Y. COLUMBIAN Bronze PROPELLERS Star Brass Mfg. Co. 53 Oliver Street -::- Boston, Mass. MANUFACTURERS OF Accurate ‘‘Non-corrosive’’? Pressure and Recording Gages, Revolution Counters, Marine Clocks. Dead Weight Gage Testers. Marine Safety and Relief Valves for all pressures. Marine Whistles and Sirens. Extra Heavy Renewable Globe, Angle and Check Valves. Star Outside Spring Steam Engine Indicators. HIGH GRADE THROUGHOUT SPECIFY AND ORDER THE BEST. Branches: CHICAGO PITTSBURGH NEW YORK Almy Water Tube Boiler Co.. Builders of Sectional Water Tube Boilers for all types of vessels Providence, R.I. U.S. A. CATALOGUE FREE BUILDING THE EMERGENCY FLEET—by W. C. Mattox THs book is more than a historical review of the war activities of a federal department. Itis a story of __ a successful American business enterprise which encountered and overcame problems common to most industrial organizations. Price $5.00, (25s.) Postpaid THE PENTON PUBLISHING CO., besc Penton Bldg. W. 3rd St. & Lakeside Ave., Cleveland, O. 410 76 MARINE REVIEW—July, 1927