Chapter 4 - Normal Surfaces in Orthographic Projections

Example 4-5

(Next look at surface (28,29,44,43))

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For identification, the visible surfaces in the top view are labeled. These have all been drawn in the side view except A and B. Surface A or B could possibly appear as lines (28,29), (46,45), or (43,44), in the front view. Use a process of elimination. B can not be on the same plane as E, C, or D. This eliminates lines (28,29) ans (43,44). Surface B is (46,45), partially hidden, partially visible, line (X,Y) in the side view. Surface A can not be on the same plane as B, C, or D. Surface A is line (28,29), line (R,S) in the side view.