Chapter 4 - Normal Surfaces in Orthographic Projections

Example 4-5

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

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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). The front of the object appears as a line (24,25) and (21,20). There are two separate surfaces on the front. These two surfaces appear as areas (27,28,43,42) and (29,30,31,44) in the front view. Projection of those surfaces into the side view gives a vertical line (A,C)