Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1826 Excerpt: ... of any single tube in such a boiler the stronger it must be made in proportion, to enable it to bear the same expansive force as the smaller cylinders. It is not essential, however, to my invention that the tubes should be of different sizes; but I prefer that the upper cylinders, especially the one which I call the main cylinder, should be larger than the lower ones, it being the reservoir, as it were, into which the lower ones send the steam, to be thence conveyed away by the steam pipe or pipes. The following general direction may be given respecting the quantity of water to be kept in a boiler in my construction: it ought always to fill not only the lower tubes but the main cylinder, A, and the cylinder, C, to about half their diameter, that is, as high as the fire is allowed to reach, and in no case ought it to be allowed to get so low as not to keep full the necks or branches which join the smaller cylinders, marked with the letter a, to the cylinders A or C; for the fire is only beneficially employed when applied, through the medium of the interposed metal, to water, to convert it into steam: that is, the purpose of my boiler would, in some measure, be defeated, if any of the parts of the tubes exposed to the direct action of the fire should present in their interior a surface of steam instead of water, to receive the transmitted heat which must, more or less, be the case if the lower tubes, and even a part of the upper, be not kept filled with the liquid. "As to the construction of the furnaces, though that must be obvious from the drawings, it may not be improper here to remark, that they should always be so built as to give a long and waving course to the flame and heated air,, or vapour, forcing them the more effectually to strike against t...
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