The Engine Room
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S.S. Jeremiah O'Brien

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Photographed by Rob Mackie
February 1998

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The O'Brien is powered by a triple expansion steam engine.  It makes 2,400 HP at 76 rpm and drives  one screw.

This is one of the few working examples remaining of a triple expansion marine steam engine.   The powerplant is fired up during the third weekend of each month, should you wish to see it in operation.

The design was common at the turn of the century but was eventually replaced by more efficient steam turbines.

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Cylinder Head

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Cylinder Head

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Engine Room

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Engine Room

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Piston Rods and Crankshaft

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Engine Room

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Piston Rod

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Cylinder Head Closeup


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