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Mechanical Drawings Volume 1-2; Progressive Exercises and Practical Hints

Mechanical Drawings Volume 1-2; Progressive Exercises and Practical Hints


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About the Book

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. 1903 Excerpt: ...plane by lines of their actual length, and parallel to cp. The fact that the projection is of the same length as the perpendicular line depends upon the condition that the picture plane cuts the projecting lines at an angle of 45. But the direction of the projection depends upon that of the visual ray. Thus if the eye be still at an infinite distance, but in the direction at, the projection will have the direction co, but its length will remain equal to ca.-Thus the direction of the projecting lines may be parallel to any element of the cone whose axis is ca, the angle at the vertex a being 90, since all these elements make angles of 45 with the picture plane MN. 217. Now any line which lies in the picture plane is its own projection. In representing a cube, therefore, as in Fig. 148, we may assume its nearer face to lie in that plane, and it will thus appear of its true form and size, that is, a square, as shown. From the preceding it follows at once that the edges which are perpendicular to MN may be represented by parallel lines of their true length, but having any direction at pleasure; which enables us to show, in addition to the front face, either the right face or the left, the upper or the lower, as may best suit our purpose. And, as the figure shows, either of these faces at will may be made more conspicuous than the other by proper selection of the angles. We have, then, a system of true oblique projection: it is more flexible than the isometric, always quite as easily executed and in many cases more so, and like it exhibits the three dimensions in one view. All lines lying in planes parallel to the paper are shown in their true forms and relations; and not only these but lines perpendicular to the paper are shown of their actual dimensions, the i...


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Product Details
  • ISBN-13: 9781231295793
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 82
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1231295791
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 163 gr


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