line engine for surface is about 100 miles from base. She is running and an electric motor for sub- equipped for warfare with two 18-inch merged running. The speed is from 11 torpedo tubes. Submergence is accom- to 12 knots on the surface, and about plished through the filling of the various 9… … face to Locate Submarine. and the Propeller. THE TWIN-SCREW LAKE SUBMARINE,
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