LOCOMOTIVE ENGINES.
717
the shallowness of the end of the fire box. This arrangementanswers the double purpose of allowing a comparatively short wheelbase and an equable distribution of the weight of the engine uponthe wheels, 11 tons, 11 tons 16 cwts., and 11 tons 16 cwts., beingcarried on the leading, the driving, and the trailing wheels respec-tively. As there is less weight on the leading wheels than on eitherof the other pairs, it might be supposed that there would be dangerof the engine running off the line under certain circumstances; butthis is not the case, as the weight actually upon the springs of theleading wheels is greater than on those of the driving wheels.
This locomotive was constructed for the conveyance of mineralor heavy goods traffic over a portion of the Furness railways, having
a, Fire box. b, Fire door. c, Body of boiler. r>, Sraoke box. e, Chimney . f, Steam ehest, g, Man-hole door. h, Injector. 1 , Cylinder. k, Valve casing. l, Leading wheel. m, Driving wheel.n, Trailing wheel. o, Frame. p, Weigh shaft. q, Line of valve spindle. r r, Water tank,s, Coal box. t t, Sand boxes. u, Brake gear. v v, Brake blocks.
gradients of 1 in 100, and 1 in 80, &c., for 11 miles. It was desiredto get as powerful an engine as possible on six wheels, with insidecylinders, and to carry fuel and water sufficient for a considerabledistance, in case it was found necessary to take the train forward onthe main line. The cylinders are between the two frames, whichextend the whole length of the engine, and are 1 inch thick.