History of the Baldwin Locomotive Works, 1831 to 1907
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. 1907 edition. Excerpt: ...arm projecting down from the sliding block, and which curved in the reverse direction from the quadrant. Two steel straps, side by side, were interposed between the quadrant and this curved arm. One of the straps was connected to the lower end of the quadrant and the upper end of the curved arm; the other, to the upper end of the quadrant and the lower end of the curved arm. The effect was the same as if the quadrant and arm geared into each other in any position by teeth, and theoretically the block was kept steady in whatever position placed on the radius arm of the rock shaft. This was the object sought to be accomplished, and was stated in the specification of the patent as follows: "The principle of varying the cut-off by means of a vibrating arm and sliding pivot block hao long been known, but the contrivances for changing the position of the block upon the arm have been very defective. The radius of motion of the link by which the sliding block is changed on the arm, and the radius of motion of that part of the vibrating arm on which the block is placed, have, in this kind of valve gear, as heretofore constructed, been different, which produced a continual rubbing of the sliding block upon the arm while the arm is vibrating; and as the block, for the greater part of the time, occupies one position on the arm, and only has to be moved towards either extremity occasionally, that part of the arm on which the block is most used soon becomes so worn that the block is loose, and jars." This method of varying the cut-off was first applied on the engine "Belle," delivered to the Pennsylvania Railroad Company, December 6, 1854, and thereafter was for some time employed by Mr. Baldwin. It was found however, in practice, that the...
- Paperback | 34 pages
- 189 x 246 x 2mm | 82g
- 28 Jun 2012
- Miami Fl, United States
- Illustrations, black and white