Sidewheel Paddle Steamboat
San Francisco Maritime N.H.P.
The Walking Beam Engine
Eureka's tall "walking beam" is the last working example of an engine-type once common on America's waterways. Manufactured by Fulton Iron Works of San Francisco, this engine remains unaltered to this day.
Oil was burned in boilers to produce the steam, which drove a huge, vertical piston. Perched atop the engine, the walking beam changed this up-and-down motion into rotary motion via a connecting rod linked directly to the paddlewheel shaft.
The twin paddlewheels (each twenty-seven feet in diameter) made twenty-four revolutions per minute.
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