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The train is drawn from the cast-iron cross frame, which, together with the longitudinal frames, is so attached as to allow of the free expansion of the boiler, to avoid any strain being put upon the latter by the haulage of the train, and to free it from the contortions formerly occurring when rigidly connected with the frames at several points.
The proper adjustment of the driving axle boxes is secured by wedge-shaped horn blocks, attached to the frames by a screw with lock nuts. The fire-box is of copper, the tube plate being | inch thick, the back plate f inch thick, and the sides and crown h inch thick.
The liability of the tube holes in the copper plate to become oval, by the pressure of the ends of the girders upon the edge of the tube plate, is also got rid of. The boiler is of Low Moor plates, ^ inch thick, and is lap-jointed. per square inch, and it is controlled by two of Kamsbottom's safety valves.
The boiler is fed by two injectors, and the water can be supplied without reference to the motion of the engine.
„ 10 332 Appendix to ditto •• 354 Discussion on ditto (1 woodcut) .... — "The Lighthouse at Gabo Island, referred to in errata at the back of contents of vol. These frames are of one solid plate, l|r inch thick, connected behind the fire-box by a cast-iron cross frame, elsewhere and by wrought- iron cross brackets and by the buffer beam, receiving the cylinders in front on each side of the smoke-box. Table of logarithms of the natural numbers, from 1 to 108,000.