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National Geographic : 1960 Feb
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NATIONALGEOGRAPHICARTIST PETER V. BIANCHI I... have invented a new... manner of buoying vessels A trip around the Great Lakes (right) appears to have given Lincoln an idea that he described in a petition for a patent. After seeing Niagara, Lincoln boarded the steamer Globe at Buffalo for a 1,000-mile cruise around the Great Lakes to Chicago. During his voyage Lincoln saw the steamer Canada piled up on an island in the Detroit River. Watching as seamen wedged bales of straw and empty barrels under gunwales to increase the ship's buoyancy, he conceived a way for a ship to float itself off such shoals. He visualized a boat permanently equipped with "expansible buoyant chambers placed at the V sides." He saw how "sliding spars" inserted in the cham bers and fastened to their bottoms could be used to make them expand and con tract like a bellows; how the 260
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