Cochran donkey boiler
The boiler has a dome-shaped furnace top that forms the bottom
of the boiler itself. It has a neck on the front through which the boiler is
fired and there is another on the rear part of the top that leads to a higher
located combustion chamber. The combustion chambers backside is covered with
brickwork and from its front-side a horizontal bank of flue-tubes leads to the
smoke box on the front side of the boiler.
The Cochran donkey boiler, or auxiliary boiler, was used in
harbor when the main boilers were not needed for the propulsion of the ship and
consequently the steam demand was low.
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Two of those were installed in the paddle steamer
Waverley in August 2000.