Chapter 4 - Normal Surfaces in Orthographic Projections

Example 4-5

(Next look at surface (37,36,35,38))

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Surface (31,32,33,34) is a visible TS area in the front view. Line (6,5) is the edge view of that surface. Line (7,6) is on the same plane as (6,5). This indicates that there must be a surface, TS in the front view as wide as (7,5). That surface is partially visible (31,32,33,34) and partially hidden (29,30,31,44) Projection into the side view gives line (A,B).