File:Blueprint reading; a practical manual of instruction in blueprint reading through the analysis of typical plates with reference to mechanical drawing conventions and methods, the laws of projection, (14757837716).jpg

Identifier: blueprintreading00fair (find matches)
Title: Blueprint reading; a practical manual of instruction in blueprint reading through the analysis of typical plates with reference to mechanical drawing conventions and methods, the laws of projection, etc
Year: 1919 (1910s)
Authors: Fairfield, Howard Parker, 1858- Kenison, Ervin Waite, Edward B. (Edward Broughton), 1873- American Technical Society
Subjects: Mechanical drawing Blueprinting
Publisher: Chicago, American technical society
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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to the pen throughout the operation and stop-ping it sharply at the end of one revolution. Since straight lines canbe more easily drawn tangent to curves than the reverse, it is alwaysadvisable to ink in all arcs or circles first. When a number of circlesare to be drawn from one center, the smaller should be inked first,while the center is in the best possible condition. PLATE I Penciling. To draw Plate I* take a sheet of drawing paper atleast 11 inches by 15 inches and fasten it to the drawing board asalready explained. Find the center of the sheet and draw fine pencillines to represent the lines DE and HK of Fig. 38. Also draw theborder lines L, M, N, and P. Now measure f inch above and below the horizontal center lineand, with the T-square, draw lines through these points. Theselines will form the lower lines DC of Fig. 1 and Fig. 2 and the toplines AB oi Fig. 3 and Fig. 4. Measure ; inch to the right and left *Note Instructions, pages 22 to 25, inclusive. 95 30 MECHANICAL DRAWING
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96 MECHANICAL DRAWING 31 of the vertical center line; and through these points, draw lines parallelto the center line. These lines should be drawn by placing the triangleon the T-square as shown in Fig. 38. The lines thus drawn, form thesides B C oi Fig. 1 and Fig. 3 and the sides A D oi Fig. 2 and Fig.4.Next draw, with the T-square, the line A B A B A^ inches above thehorizontal center line, and the line D C D C 4f inches below the hori-zontal center line. The rectangles of the four figures may now becompleted by drawing vertical lines 6f inches on each side of thevertical center line; these rectangles are each 6^ inches long and 4^inches wide. Fig. 1. Exercise with Line Pen and T-square. Divide the lineA D into divisions each j inch long, making a fine pencil point orslight puncture at each division such as E, F, G, H, I, etc. Nowplace the T-square with its head at the left-hand edge of the drawingboard and through these points draw light pencil lines extending tothe line B C. In dr

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