The Railway Locomotive, What It is And Why It is What It is
The Railway Locomotive, What It is And Why It is What It is
Pendred, Vaughan
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This is much less than the area through the grate bars ; very much less than the area of fire hole combined with that of the grate opening. It would be wrong, however, to suppose that it is too small. So far is this from being the case that it is only with the greatest difficulty that an equal distribu- tion of the products of combustion among the tubes can be secured. They invariably follow the line of least resistance. It may be taken that in general they will select the highest tubes and wil...l avoid those at the sides, but as will be shown presently, there are exceptions. Draught is measured in inches of water. The horizontal prolongation of one leg of a U-shaped glass tube passes through the side of the smoke-box. When the engine is running, the exhaust establishes, as we have seen, a partial vacuum in the smoke-box. The water falls in one leg of the vacuum gauge and rises in the other. The diflference in level is measured in inches and fractions of an inch. Under ordinary working conditions it varies between about one inch and seven inches.
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