A Practical Treatise on the Movement of Slide Valves by Eccentrics; For the Use of Engineers, Draughtsmen, Machinists, and Students in General

A Practical Treatise on the Movement of Slide Valves by Eccentrics; For the Use of Engineers, Draughtsmen, Machinists, and Students in General

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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. 1873 edition. Excerpt: ...M being the line of motion, the eccentric at the beginning of the stroke will be at c in the vertical line x y, through 0 the centre of revolution. Next, by the process described in connection with Figs. 47 and 48, construct the movement of the cut-off valve, as though the seat were fixed; and about c as a centre, describe a circle with a diameter equal to the travel found to be requisite for the cut-off valve, and draw the lever-arm c d of its eccentric in its proper angular position, as found in the separate diagram like Fig. 47; d 0 will be the lever-arm of an eccentric revolving, with the one whose leverarm is c 0, about 0 as a centre, which will give the cut-off valve its proper motion with regard to the main valve, as shown in the figure. 110. Nothing has been said of any lap upon the main valve, nor of any lead given to either; nor is it necessary for us to illustrate by a diagram the process of constructing the movement if these elements are introduced because the diagrams of the main and the cut-off" valve movements are in any case constructed separately, and then combined as just shown. Consequently, were lead given to both valves in Fig. 64, we should only have c a little to the left of its present position, aud d c s, the angle made by d c with a horizontal line, would be a little less. We have in the diagram endeavored to illustrate the action of the eccentric d, by introducing in each of the four positions in which the eccentrics are shown, a smaller diagram, showing the virtual revolution of d about c, and its action upon a valve and port; the ones in the positions c, c1, corresponding to the valve no and port Im of Fig. 60; those at c2 and c3 corresponding to p q, i Jc; it is hardly necessary to add that if lead were...show more

Product details

  • Paperback | 44 pages
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236554922
  • 9781236554925