![]() A first auxiliary plan is drawn in the direction of arrow X. The first auxiliary plan from the frontĮlevation gives triangle FDH, and the first auxiliary plan from the end elevation gives triangle FCD, both right-angled triangles.įigure 11.4 shows the front elevation and plan view of a box. The true length of DF could also have been obtained by projection from the front or end elevations by viewing at 90° to the line, and Fig. Other auxiliary views could be projected from this auxiliary elevation if so required. Since this is the first auxiliary view projected, and from a true plan, it is known as a first auxiliary elevation. A plan is projected from an elevation and an elevation from a plan. Note that auxiliary views are drawn on planes other than the principal projection planes. 11.2 gives the true length required, which forms part of the right-angled triangle DFG. To find the true length of DF, an auxiliary projection must be drawn, and the viewing position must be square with line DF. the corners on the remote side are indicated in rings. The corners nearest to the viewing position are shown as ABCD etc. A cross check with the isometric view will clearly show that the true length of line DF must be greater than any of the diagonals in the three orthographic views. 11.2, and it will be apparent that the projected length of the line DF in each of the views will be equal in length to the diagonals across each of the rectangular faces. Three orthographic views in firstangle projection are given in Fig. The corners of the block are used to position a line DF in space. ![]() An isometric view of a rectangular block is shown in Fig.
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