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TELESCOPE July 147 IN THE TRIFLE'S WAKE... Triple-expansion engine built 1893 at Detroit by Dry Dock Engine Works for the freighter Selwyn Eddy. Cylinders were 22, 35 and 56 inches in diameter, and length of stroke of their pistons was 44 inches. --From Around the Lakes, Detroit Dry Dock Co., 1894. by Gordon Bugbee A Review of Engines Introduced to Power Upper Lakes Bulk Freighters in Modern Times When the nuc1ear-powered merchant ship Savannah appeared several years ago, the New York Times found it odd that the atomic age should find a partner in the seemingly-obso1ete steam engine. Savannah's designers had of course made steam from the heat of her reactor to power a conventional steam engine. The world's merchant fleets had turned to using motorships, the Times editorial continued, and only on the Great Lakes did steam engines still prevail among large ships. Diesel engines first came to the lakes half a century ago. But they have been a long time in making any mark on the lake bulk freighter fleet. The longtime king of the fleet was the trip1e-expansion reciprocating engine. When at last it abdicated, about twenty years ago, a contest for its place grew between its cousin, the Unaflow, and the steam turbine. Among older lake ships that were repowered, the match was about an even draw, while the turbine took the prize among new ships. The diesel made hardly any showing at all. But now, belatedly in the sixties, the diesel engine is beginning to find its place, both in new lake ships and in repowered ones.