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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.
Cochran Marine Thermax
A modern version of the Cochran steam boiler. This three pass
wetback boiler is designed to comply with European specifications.
Two of those were installed in the paddle steamer Waverley in August 2000.
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