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III] BOILER IMPROVEMENTS 53


in the manner peculiar to marine practice, into a header or cylinder at the top of the box and, at the bottom, into two water legs or drums extending laterally along the sides of the fire-box. The high pressure of 255 lbs. per sq. in. is employed.

Fig. 17. Marine type of water-tube fire-box; Northern of France Bailway.

A fire-box of this type has been fitted to one of the new Baltic 4-6-4 type engines of the Northern of France Railway, illustrated in Fig. 19.

It is, however, Mr Drummond who has made the most consistent use of the water-tube principle, and practically all the engines on the London and South Western Railway are so fitted.

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