1862 London Exhibition: Catalogue: Class VIII.: Ravenhill, Salkeld and Co
1962. RAVENHILL, SALKELD, and CO., Glass House Fields, Ratcliff, and Orchard Wharf, Blackwall.
Models of marine steam engines.
1. MODEL OF ENGINES with feathering paddle wheels, of the Holyhead mail packets Leinster and Connaught, each of 720 horses nominal power.
This is an application of the oscillating cylinder to the largest class of marine steam engine, each cylinder 98 inches (eight feet two inches) internal diameter, weighed, when finished, upwards of twenty tons the condenser weighed twenty-two tons. The engines were fitted with eight tubular boilers, having forty furnaces and 4,176 tubes, giving a total length of four and three quarter miles of tubing, and the vessels attained an average speed at the official trial in Stokes Bay of eighteen knots or twenty-one miles an hour. The engines exerting an indicated power of 4,751 horses.
The first pair of engines with oscillating cylinders constructed by the exhibitors was fitted in the year 1838, and engines have since been manufactured by them upon this principle of the aggregate nominal power of 22,000 horses.
2. MODEL OF ENGINES with horizontal cylinders and double piston-rods of 500 horses nominal power for screw-propellers, such as are fitted by the exhibitors on board Her Majesty's 90-gun line-of-battle ships.
This model represents the plan of engines of the larger class made by the exhibitors for the British and foreign Governments, and is arranged so as to afford easy access to all the working parts.
The exhibitors were the first to introduce the double piston-rod engine into the British navy, engines of 300 horses nominal power so fitted having been made by them in the year 1845, since which time the following ships in her Majesty's service have been so fitted by them:—
Adventure. Alacrity. Alert. Amphion. Ariel. Assurance. Brunswick. Centurion. Charybdis. Clio. Coquette. Dromedary. Emerald. Falcon. Fawn. Fox. Gannet. Glasgow. Greyhound. Jason. Lapwing. London. Lyra. Narcissus (1). Nelson. Neptune. Newcastle. Pelican. Pelorus. Pioneer. Racoon. Rattlesnake. Ringdove. Roebuck. St. George (2). Surprise. Swallow. Tamar. Undaunted. Victor. Waterloo. Wolverine.
This list refers only to engines made upon the double piston-rod plan, many other vessels in her Majesty's service having been fitted by the exhibitors upon various other systems, arranged according to the requirements of the service.
(1) Narcissus, 50-gun frigate, bearing the flag of Rear-Admiral Sir Baldwin W. Walker, Bart., K. C. B., late controller of the navy on the Cape of Good Hope station.
(2) St. George, 90-gun ship, on board which His Royal Highness Prince Alfred has been serving on the North American and West Indian station.
3. MODEL OF ENGINES of the same power as No. 2, arranged for surface condensation.
4. MODEL OF MARINE STEAM ENGINES, with inclined oscillating cylinders, designed for vessels having a small section with considerable rise of floor. Engines on this plan have been constructed by the exhibitors up to 240 horses nominal power. It is a light form of engine, and has given great satisfaction.