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This steam-crane was designed by J. Campbell Evans for use on board steam-vessels. Its special advantages are: compactness, facility of fixing, simplicity in the mode of working, and durability. The boiler A is placed as close as possible to the crane, and revolves with it, The top of the boiler is made of cast iron, with lugs for attaching the tension-rods of the crane-arm. In this way, it serves the double purpose of boiler and crane-post.
The bed-plate B upon which the boiler and crane are placed is fixed to the foundation plate C by a centre bolt, which bears all the upward strain; the downward pressure is taken by the rollers D running on the foundation plate C. This plate is solidly embedded on timber laid on the deck of the vessel.
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