A Rudimentary Treatise On The Steam Engine

Author : Dionysius Lardner
Publisher : Theclassics.Us
ISBN 13 : 9781230307329
Total Pages : 38 pages
Book Rating : 4.3/5 (73 download)

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Download or read book A Rudimentary Treatise on the Steam Engine written by Dionysius Lardner and published by Theclassics.Us. This book was released on 2013-09 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1848 edition. Excerpt: ...a chimney of sufficient height, the vertical column of heated air thus formed has a certain buoyancy or tendency to ascend into the atmosphere, proportional to the difference between its weight and the weight of an equal column of common air. This difference will be so much the greater as the column has greater magnitude and height, provided only that every part of it shall be, bulk for bulk, lighter than air. Hence obviously follows the necessity of a chimney in creating a draft, whether through the furnace of a steam engine or in any ordinary manner. 3. In stationary engines, as used in the arts and manufactures, chimneys of any desired magnitude can generally be attached to the engine. It is not necessary that the chimney should be immediately over or contiguous to the furnace; it may be placed at a considerable distance from it, provided only it be connected with it by the proper air passages. This is often a matter of convenience in factories, and we accordingly see the chimney frequently erected at a considerable distance from the boilers and furnaces. 4. But in numerous applications of the steam engine it is not practicable to use chimneys of such elevation, or so placed, and in some cases the tube provided for the escape of the products of combustion must necessarily be so short as to afford no draft of appropriate amount. 5. Such is the case, for example, in locomotive engines: in marine engines this is to some extent also true, --the chimney must be comparatively short. 6. When sufficient length of chimney is not admissible, we are compelled either to throw in the gases of combustion at a very high temperature, so as to make up for want of height in the column, or to adopt some other expedient for creating a draft. 7. A wheel is..