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September, 1925 MARINE REVIEW For driving small vessels (and for main generator drive of motorships) HE Small-Unit Bethlehem Oil Engine is built to the same high standards as the Large-Unit Engine, and is ideal, either as the main propelling unit in small craft, or for driving the generators in motor- ship installations. It is a two-cycle, port-scavenging engine, built on a simple design which, combined with strong, rugged construction, enables the © engine to stand up through the continuous hard service so often demanded in marine applications. The design of the Small-Unit Bethlehem Oil Engine is unusually free of complications. The cylinders have no mechanically-operated valves; there are no camshafts or rocker arms. Fuel injection is by the airless method, and the engine is started by compressed air, controlled by a simple mechanism. Scavenging air is not obtained by crankcase compression, but is supplied by an attached independent pump—by far the most satis- factory method. The advantages of the Small-Unit Bethlehem Oil Engine—its rugged, simple design, its endurance, its high fuel ecoonomy—will appeal to marine engineers. Ask for complete details. BETHLEHEM SHIPBUILDING CORPORATION, LTD. BETHLEHEM, PA. GENERAL SALES OFFICES: 25 BROADWAY, NEW YORK CITY District Offices: Boston, 100 Milk St.; Wilmington, Foot of West St.; Chicago, Monadnock Bldg.; Philadelphia, Widener Bldg.; Baltimore, South and Water Sts.; San Frencisco, Matson Building. Units of two, three, four and six cylinders Built in sizes of from 50 to 480 B oH. P. BETHLEHEM Small-Unit Type OIL ENGINE Please mention MARINE REVIEW when writing to Advertisers