Steam crane of the 1860s
Designed by J. Campbell Evans
overgenomen uit Spon's Dictionary of Engineering, Div. VI, pp.2237-2239, edited by Oliver Byrne and published by E.& F.N. Spon, London (1873)
This steam-crane was specially designed 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.