ANGLES IN OBLIQUE

Figure 5-51.-Cabinet projection. Distances along front axis are true; distances along receding axis are reduced by one half. 60 degrees because they are easily constructed with triangles (fig. 5-52). IRREGULAR LINES.— An irregular line in an oblique drawing is a line that would be an oblique line in a normal multi-view projection. In the upperpart of figure 5-53, there is a Figure 5-53.-Cavalier projection of an object with irregular lines. two-view multi-view projection of a block; the line AB is an irregular line and will not appear in its true length in an oblique projection. To transfer the line, you draw the projection by transferring measurements taken along regular lines; these measurements locate the end points of the irregular line. Figure 5-53 shows the cavalier projection of an irregular line. The procedure for cabinet projection would be the same except that all measurements along the receding axis would be reduced by one half. ANGLES IN OBLIQUE.— In an oblique projection, an angle on the surface that is parallel to the plane of projection will appear in its true Figure 5-52.-Angles of 30 degrees, 45 degrees, and 60 degrees are normally chosen for the receding axis in oblique projection because they are easily drawn with triangles. . 5-27