Chapter 4 - Normal Surfaces in Orthographic Projections

Example 4-5

(Next look at surfaces (41,42,39,40) and (31,32,33,34))

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Surface (42,31,34,35,36,37,38,39) is a visible TS area in the front. Line (26,19) is the edge view of that surface. Projection into the side view gives line (A,B).