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Home > Drafting Instruments and Operations: (English)
Drafting Instruments and Operations: (English)

Drafting Instruments and Operations: (English)

          
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About the Book

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. 1885 edition. Excerpt: ...figures divided by a line, on each side of which the shade lines shall proceed in different directions, as in PI. III. Fig. 4. 134. Where it is desired to produce a regular and well-marked gradation of shade over a surface by means of ruled or circular lines, these lines must regularly diminish in size and become further apart, from the darkest to the lightest part of the surface. See PI. III. Figs. 5 and 6. Increase of.distance between the lines, merely, without variation in their size, occasions only a faint contrast between the darkest and lightest part of the shading. Such lines may be parallel, converging, or curved, according to the shape of the surface to be shaded. 135. Converging shade lines, as in PI. III. Figs. 6 and 9, are somewhat difficult to manage, and may be made to taper as they approach the vertex. Or else, they may be made parallel to an outside line of the group. Curved shude lines, as in Figs. 7 and 10, are easily drawn when the lightest spot of the shading has the common centre of all the shade lines for its centre, but become more difficult when the lightest spot is not at this centre; for then the shade lines must taper as they approach the light spot. Otherwise, in the latter case, the shading may be produced by uniform fine circular shade lines, together with radial shade lines of different sizes--heaviest and closest together where the shading is to be darkest. Let the student first study carefully, and then imitate the groups Figs. 5, 6, 7, and 8, 9, 10, PI. III., which give practice in the use of parallel, converging, and curved shade lines. 136. Drawings, and the wood, or lithograph line engravings which represent them, may be plain, half-shaded, or darkly shaded. Half-shading requires little or no change in...


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Product Details
  • ISBN-13: 9781230142326
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 54
  • Series Title: English
  • Weight: 113 gr
  • ISBN-10: 1230142320
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 3 mm
  • Width: 189 mm


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