Norris's hand-book for locomotive engineers and machinists by Norris Septimus

Author:Norris, Septimus
Language: eng
Format: epub
Tags: Locomotives
Publisher: Philadelphia, H.C. Baird
Published: 1852-03-25T05:00:00+00:00

fire-box up to the arched roof of the external firebox ; and this flat surface requires to be powerfully stayed by angle-irons and tension-rods. We remember an instance in which the accidental omission of one of the numerous tension-rods led to the forcing out and partial explosion of the side of the fire-boXy showing how much depends on the circumstances of these rods, with their joints and pins, remaining sound and uninjured from corrosion or other source of injury or decay. In this respect the round fire-box, with its dome, has the advantage of superior strength and safety. A large steam-dome is found to be the most efficacious mode yet tried for preventing the evil of priming or damp steam; but no height of dome will entirely prevent it if there be not space enough left above the tubes in the cylindrical part of the boiler t6 allow the free passage of the steam along to the fire-box and dome, while an excessive height of dome is also found to produce an unsteady motion of the engine, by causing the machine to be toprheavy. A height of about 2 feet 6 inches above the cylindrical part of the boiler is found to give satisfactory results in practice, and to lead to the production of as pure steam as any greater altitude could secure. In some engines the steam is withdrawn from a dome placed at the smoke-box end of the boiler, into which the steam-pipe rises. It is thought that the ebullition being less violent at this point, the steam

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