Mechanical Drawing for High Schools; A Text with Problem Layouts

Mechanical Drawing for High Schools; A Text with Problem Layouts

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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. 1919 edition. Excerpt: ...eyes are specified by diameter and length over all. 79. Conventional Symbols.--There are a number of commonly accepted symbols used on drawings. The symbols for represent Hanger Bolt Drive Screw 7aD/e Bolf and Wing Nut Fig. 158.--Various bolts and screws ing the cut surfaces of sectional views as given by a committee of the American Society of Mechanical Engineers are shown in Fig. 159. For showing the cross-section of long, uniformly shaped pieces and for "breaking out" parts the representations of Fig. 160 are used. 80. Blueprinting.--Practically all work in shops or on structures is done from blueprints, which are copies made from a tracing, on chemically treated paper, giving white lines on a blue background. As many copies as desired can be made from a single tracing. Blueprints can be made from pencil or ink drawings on tracing cloth, tracing paper or bond paper. The original drawing is never allowed to go into the shop but is kept in the files of the drawing room. Blueprint paper is usually bought ready sensitized and may be had in different degrees of rapidity, when fresh it is of a yellowish green color and an unexposed piece should wash out perfectly white, with age or exposure to light or air it turns to a darker gray blue color, and spoils altogether in a comparatively short time. 81. To Make a Blueprint.--Place the tracing in a blueprint frame with the inked side next to the glass and lay a sheet of blueprint paper with the sensitized side next to the tracing. Put the back of the frame in place and lock it in position so as to hold the tracing and paper. Expose to sunlight or electric light for from 30 seconds to several minutes, depending upon the sensitiveness of the paper. The yellowish green color of the...show more

Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236963369
  • 9781236963369