Modern American Railway Practice First Second And Third Year Examinations For Locomotive Firing And Running

Author : W. G. Wallace
Publisher : Rarebooksclub.com
ISBN 13 : 9781230019277
Total Pages : 142 pages
Book Rating : 4.0/5 (192 download)

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Download or read book Standard Mechanical Examinations on Locomotive Firing and Running; Being the Progressive Examinations for the First, Second, and Third Years, Which We written by W. G. Wallace and published by Rarebooksclub.com. This book was released on 2013-09 with total page 142 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. 1906 edition. Excerpt: ...the cylinders, as the steam rushes in, corresponding with the travel of piston. After the steam has exerted its force, it is then required to have a free and rapid departure, by having a wide passage before the piston has reached the end of its stroke. TABLE No. 2.--In referring to this table we find what may be called a short lap valve, as 'the lap is much shorter than is used in a locomotive with link motion, it being a %th lap valve, having %-inch on each end, the length of valve-face being 94; of an inch longer than the extreme distance between the outside edges of steamports, the inside having no lap, the throat or cavity of valve being the same width as the distance between the inner edges of steam-ports; lead I-I6-inch in full stroke, rock shaft being used; diameter of cylinder, I 5 inches; stroke, 24 inches; throw of eccentric, 4 inches, being the same motion as Table No. I, except the increase of lap.. In referring to tables-, we find a very different motion. as Table No. 2 shows that we have gained the position required for the valve for admission of steam, for all the notches, nearly to half stroke; we also find a decided improvement toward working the steam expansively, as the table shows, from the fourth to the eighth notch. That twenty-five per cent of the distance that the steam follows the piston is worked expansively, from the fourth to the eighth notch. We also find the same d-ifiiculty as that shown in Table No. 1, by premature or too early lead, as we find, by referring to Table, that lead commences 1%; inches from end of stroke, when working in the fourth notch, and 1% inches from end of stroke, when cutting ofi at half-stroke, or working in the sixth notch; and when working in the eighth notch, or cutting...