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December, 1926 MARINE REVIEW 55 Contra- Propeller Contra-propeller as installed on S.S. Lehigh American Vessels equipped with Contra-Propellers. S. 8S. NORFOLK S. S. SUFFOLK S. S. SAMUEL Q. BROWN Tidewater Oil Co. Coastwise Transportation Co. §, S, FLORENCE LUCKENBACH S. S. STEEL NAVIGATOR S. S. FAIRFIELD CITY M. S. STEEL CHEMIST M. S. STEEL ELECTRICIAN S. S. STEEL TRAVELER Isthmian Steamship Lines S. §. DIRIGO S. S. HARVESTER The Texas Co. . $8. SANTORE . 5. FELTORE . 5S. FIRMORE . 8. CUBORE os». DL EDLORE Ore Steamship Co. S. 8S. JONANCY S. 8. FREEMAN Ss. S. BYLAYL Pocahontas Steamship Co. HANnNNN Luckenbach Steamship Co. S. $8. CALISTOGA Monticello Steamship Co. S. 8S. LEHIGH Bethlehem Transportation Co. T. S. S. JOHN D. ARCHBOLD Standard Oil Co. of N. J. S. S. ELISHA WALKER Pan American Petroleum & Transportation Co. S. S. DIXIE ARROW Standard Transportation Co. TUG LYDON TUG JAS. EDWARD Great Lakes Dredge & Dock Co. S. S. GULFLAND Gulf Refining Co. S; 5: bEMISA United Fruit Co. means Increased Propulsive Efficiency =< ae Type of Contra-Propeller installed on M.S. Steel Chemist and M.S. Steel Electrician ‘Tos installation of a Contra-Propeller makes possible a de- crease of from 10% to 20% in indicated horsepower with the vessel maintaining the speed made prior to fitting the Contra-Propeller, or conversely it will realize a corresponding, increase in speed, maintaining the old horsepower. Further- more, the direct rearward wake produced by the Contra- Propeller insures better steering and reduces rudder pintle wear, while the horizontal blades also diminish pitching. The resultant lower operating cost justifies the investment. The Contra-Propeller is manufactured in the United States solely by the Bethlehem Shipbuilding Corporation, Ltd. under license from Th. Goldschmidt Corporation, 68 Beaver St., New York City, exclusive representative for the United States and Canada. Write us and obtain the benefit of advice from our ex- perienced engineers. BETHLEHEM SHIPBUILDING CORPORATION, LTD., BETHLEHEM, PA. GENERAL SALES OFFICES: 25 BROADWAY, NEW YORK CITY District Offices in Boston, Philadelphia, Wilmington, Baltimore, Cleveland, Chicago, San Francisco BETHLEHEM — Please mention MARINE REVIEW when writing to Advertisers