Chapter 4 - Normal Surfaces in Orthographic Projections

Example 4-5

(Next look at surfaces (27,28,43,42) and (29,30,31,44))

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The top of the object appears as a line (27,30) in the front view. The top appears as an area (11,10,9,8,7,6,20,21,22,23,24,25) in the top view. Projection of that surface into the side view gives a horizontal line (A,B).