Elements of Mechanical Drawing. Use of Instruments, Geometrical Problems and Projection

Elements of Mechanical Drawing. Use of Instruments, Geometrical Problems and Projection

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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. 1894 edition. Excerpt: ...1' 5', or 2' 5'. In the same manner the front axis of projection A D, may be considered as the front view of the top plane of projection, or the top view of the front plane, and the vertical axis A C, as the front view of the side plane, or the side view of the front plane of projection. GENERAL INSTRUCTION FOR DRAWING. 55 GENERAL INSTRUCTION FOR DRAWING. The dimension of the paper will be the same as for the GEoMETRICAL Pnoauams, the margin line enclosing a space 10x14 in. Where several problems are designed for the same sheet, it is desirable to separate them by a fine inked line. Four sheets will, in general, be required for each plate of problems. All construction lines and lines of the object should be drawn very fine in pencil, and no line that has been useful in the construction of the drawing should be erased. Invisible lines of the object are better dotted in pencil, that no mistake be made in inking the same. Draw no dimension lines. Absolute accuracy must be used in the construction of all figures. Only lines of the object are to be inked, the visible lines being in full and the invisible in dotted lines. Shade lines are to be used only in those problems indicated, and never shown in pencil. There is but one reason that can justify the use of the shade line, and that is, added clearness to the representation by indicating the relation of the surfaces to one another. It often adds much to the beauty of a drawing, and for that reason may sometimes be employed. By some draughtsmen the shade line is never used, while by others it is always used, and both are in error since no law can be established concerning it, there being times when it is a mistake not to use it, and others where it is equally wrong to...
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Product details

  • Paperback | 28 pages
  • 189 x 246 x 2mm | 68g
  • United States
  • English
  • black & white illustrations
  • 1236873769
  • 9781236873767