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42 MARINE REVIEW May; 1924 WARREN MARINE PUMPS Every Ship’s Officer Should Have These Seven Books They tell you everything you want to know about ships and navigation. An encyclopedia of information that no ship’s officer should be without.: Written by experts in terms that you can understand. May be ordered separately or as a set. Will save you many times their cost. I. C. S. NAUTICAL LIBRARY Volume | pairs; Pumps. 677 pages. 285 Nautical Astronomy; Latitude; Lon- illustrations. gitude and Azimuth; Sumner’s Volume 5 Method; Mareq. St. Hilaire’s Method; Ocean Meteorology; Inter- national Rules and Signals. 550 pages. 170 illustrations. . Volume 2 Arithmetic; Algebra and Formulas; Elements of Geometry; Chart, Lead and Log; Piloting and Dead Reckon- ing; Deviation and Compass Com- pensation. 546 pages. 263 illus- trations. Volume 3 Marine Boilers; Firing; Feeding; Repairs; Inspections; Propulsion of Vessels; Refrigeration. 591 pages. 209 illustrations. Volume 4 Principles of Mechanics; Mechanics of Fluids; Heat and Steam; Elec- tricity and Magnetism; Direct Cur- rent; Generators and Motors; Steam Turbines. 530 pages. trations. Volume 6 Mechanical Drawing; Sketching ; Ge- ometric Drawing; Ship Drafting; Practical Projection; Development of Surfaces. 880 pages. 270 illus- trations. Volume 7 Radio Devices: Radio Communica- tion; Electron Tubes; Electricity and Magnetism; Codes and Code Prac- 283 illus- — MORE THAN 150 LAKE FREIGHT AND PASSENGER STEAMERS HAVE COMPLETE WARREN EQUIPMENTS. tice; Damped and Undamped Wave Radio Telegraphy. 3863 pages. 234 illustrations, Screw - propeller Engines; Engine Indications; Engine Testing; Marine Slide-valve Gears; Condenser; Re- WARREN STEAM Pump Co. MAIN OFFICE AND WORKS WARREN, MASS. Write for 96-page catalog, which describes these seven books and many others that you'll want to have in your ship’s library. ‘INTERNATIONAL CORRESPONDENCE SCHOOLS Box 8741, Scranton, Penna. Cap’n Allswell says: “‘It’s easy to tell that some folks trust in luck by the way they buy propellers’’ Experienced people and those that listen to experts just naturally think ‘‘Columbian” when on the propeller subject. Columbians are scientifically designed to reduce slippage, vibration, and everything that’s not just right about a wheel. (Send for. propeller infor- tion). Columbian Bronze Corp., 238 N. Main St., Freeport, N. Y. COLUMBIAN Bronze PROPELLERS New York City Sales: 44 Third Avenue FOSTER MARINE BOILERS In use in over 130 vessels of American Merchant Marine. Write for performance data. Foster Marine Boiler Corp. Chicaz. Sanfrancisco Pitta London, Eng- 111 Broadway, N. Y. Chicago SanFrancisco Pittsburgh London, Eng. Baltimore, Proctor Eng. Co.; New Orleans, Marine Specialty Co.; Galveston, Steamship Supply Co.; Cleveland, R. G. Backus. 8,000 TON DRY DOCK AT BOSTON THE LARGEST AND MOST COMPLETELY EQUIPPED | SHIP REPAIR YARD IN THE \ PORT OF BOSTON FIVE DRY DOCKS THE ATLANTIC WORT INCORPORATED 1853 EAST BOSTON, MASS. Please mention Marine REvIEW when writing to Advertisers