HMS Terrible
See Wikipedia entry.
This entry refers to the HMS Terrible launched in 1895.
She was the second and last of the large Powerful-class cruisers. They were of the "protected" class (i.e. without side armour), of 14,200 tons and a speed of 22 knots. Designed by William Henry White, and constructed by J. and G. Thomson of Clydebank.
1895 The machinery was described in Engineering 1895/06/07. Extracts: '.... These main engines are each of the four-cylinder triple-expansion type. Each of the two sets is designed to develop 12,500 indicated horse power, giving a combined indicated power of 25,000 indicated horse-power. Steam is supplied by 48 water-tube boilers of the Belleville type, to be described later. The safety valves on the boilers are loaded to a pressure of 260 lb. per square inch, this pressure being reduced to 210 lb. at the engines by means of a Belleville patent reducing valve placed at the forward end of each engine-room. ..... The diameters of the high and intermediate pressure cylinders are 45 in. and 70 in. respectively, while the diameter of each of the low-pressure cylinders is 76 in., all having a stroke of 4 ft. The high-pressure cylinders are placed forward, and each fitted with piston valves of the inside type, having improved adjustable packing rings, while the intermediate and low pressure cylinders fitted with treble-ported flat slide-valves on their sides, having a special type of relief frame to relieve them of steam pressure, and the weight of all the valves is suitably balanced in order to reduce the strain on the valve gear as far as possible. .... The cylinders, which are entirely independent castings, are bolted together to provide sufficient longitudinal stiffness ; and to further increase their stability in case of ramming, &c., strong struts are fitted between the high-pressure cylinder and the forward structure of the vessel, as well as transversely between the respective cylinders in each engine-room. ....'.
The Belleville boilers, constructed by J & G Thomson, were described and illustrated in Engineering 1895/06/28
See Also
Sources of Information
- Biography of Sir William Henry White, ODNB [1]