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MARINE ENGINES. 387
managed. Such boats have strong, carefully-modeled hulls,
light and strong boilers, capable of making a large amount
of dry steam with little fuel, and a light, quick-running en-
gine, working without shake or jar, and using steam eco-
nomically.
FIG. 135.-Launch-Engine.
The above sketch represents the engine built by a New- York firmi for such little craft. This is the smallest size made for the market. It has a steam-cylinder 3 inches in diameter and a stroke of piston of 5 inches, driving a screw 26 inches in diameter and of 3 feet pitch. The maximum
