Engineering Drawing from the Beginning. Volume 2 by M. F. Cousins, N. Hiller and G. E. Walker (Auth.)

By M. F. Cousins, N. Hiller and G. E. Walker (Auth.)

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The line CD has now been divided into nine equal parts. This method of dividing is extremely useful and should be practised for various lengths of lines and number of divisions. It will be found that this technique has many applications. 8. THE DIAGONAL SCALE (i) The Principle. Fig. 11(c) The principle of the diagonal scale is shown in Fig. 11(c). ). Draw another line, CD, parallel to it, and half an inch from it. Close the ends so as to form a rectangle. Now divide AB into ten equal parts (as shown in Fig.

Fig. 15 The principle involved in first angle projection is that each view is drawn exactly as it is seen; that each view is projected orthographically; and that each view is turned through 90° from its adjacent view. We will take a simple object shown as an isometric drawing in Fig. 15(a). This is a rectangular block 2 in. X 2\ in. X \ in. with a raised shoulder at one end 1 in. high X \ in. wide. To make a drawing in first angle projection proceed as follows: (i) Look at the object in the direction of arrow A and draw the shape exactly as you see it.

Each side of the centre line. , and therefore a line should be drawn parallel with the base line but \ in. above it. Two vertical lines should be drawn parallel with, and f in. from, the two outer lines. To show the recess in the elevation and the plan a line should be drawn vertically each side of the centre line and 1 in. from it. To show the thickness of the back in the plan, a line should be drawn J in. below the second 50 — ISOMETRIC — - FIG 24O0 REFER 14 ì1 7ΐ 6. i-L li Hi- I* LttNE β ν LINE CONSTRUCTION.

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