The boiler is 11 ft. long by 4 ft. 2 in.
diameter; the grate area is 16.25 square feet; and the heating surface is,
tubes, 1,216.5 square feet; fire-box, 97.0 square feet; total, 1,313.5
square feet. The boiler pressure is 140 lb., and the tractive power per
lb. of steam pressure in the cylinders, 88 lb. The weight in full working
order is on the leading wheels, 10 tons 5 cwt.; driving wheels, 11 tons;
trailing wheels, 9 tons 15 cwt.; total, 31 tons.
[Illustration: FIG. 3.--LONDON & NORTH-WESTERN RAILWAY.]
[Illustration: FIG. 4.--JOY'S VALVE GEAR.]
Turning now to the London and North-Western Railway, we find that between
1862 and 1865 the express trains were worked with a handsome type of
engines, known as the "Lady of the Lake" class. They have outside
cylinders 16 in. diameter and 24 in. stroke, with single driving wheels of
7 ft. 6 in. diameter, and leading and trailing wheels 3 ft. 6 in.
diameter, with a total wheel base of 15 ft. 5 in. The frames are single,
with inside bearings to all the wheels. The boiler is 11 ft. long and 4
ft. diameter, and the heating surface is in the tubes, 1,013 feet;
fire-box, 85 ft.; total, 1,098 feet. The tractive power per lb.
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