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Model of Paddle-wheel Steam Engine:
This model demonstrates how the engine and paddle-wheel of a steam-powered vessel operated. Steam from the boiler (not shown) pushed the piston up and down. The piston shaft was connected to one end of the working beam, commonly called a "walking beam." The opposite end of the beam is connected to the crankshaft which turned the paddle-wheel. The engine of the Mississippi was essentially this engine turned on its side to fit below the deck of the ship.
Conquering the Wind:
For thousands of years, oars and muscle power drove ships. A major shift occurred by the mid-15th century: sails that could harness the wind. With sails, ships could travel virtually anywhere and crews were liberated from the labor of rowing. Since no vessel can sail into the wind, however, maneuverability of the ships was limited.
The introduction of steam power in the 19th century was a major revolution in naval design and made it possible to maneuver ships, regardless of wind and tide. |