National Geographic : 1959 Mar
POWERAUTHORITYOF THE STATEOF NEWYORK Gantry Crane Lowers a 155-ton Turbine Runner at Moses-Saunders Dam The runners, actually propellers in reverse, convert the energy of rushing water into electricity. Workers guide the assembly onto the runner cone before lowering it into place 45 feet below. Crane operator in glassed-in cab (upper right) follows their signals. Driven by 32 such units, the dam's generators will produce 1,880,000 kilowatts. The night before we entered Snell and Eisenhower Locks, Prins Willem V anchored; Captain Leer wanted daylight for his first transit through the new ship lifts (page 304). At dawn we moved up, flying an American flag for the passage through U. S. waters. As the lower gate of Snell Lock opened, a steel boom holding a heavy cable lifted ahead of us. It was one of the fenders that pro tect lock gates on both sides. A ship out of control approaching a gate would strike the fender first. The steel carrier arm would shear apart, but the wire 338 rope, anchored on both sides of the lock, would hold. Fender cables, three and a half inches thick, run down through bollards to a hydraulic braking mechanism in the lock walls. Each fender can absorb the shock of a ship up to 20,000 tons moving at 4.5 miles an hour. Costly but essential insurance for the gates. In just eight minutes 22,000,000 gallons of water, fed in by gravity from upstream, raised us 45 feet. Then the upper lock gate opened. and we steamed through the Wiley-Dondero Ship Channel and Eisenhower Lock. We overtook the ore ships Edwin T.