Figure 5-17.-Multi-view analysis of a third-angle orthographic projection.Figure 5-18.-Procedure for numbering hidden and visiblecorner points.of which view you are considering. This meansthat, in a third-angle projection, each view of asurface of an object is a view of that surface asit would appear to an observer looking directlyat it.Figure 5-17 shows a six-view multi-viewthird-angle projection of the block shown in asingle-view projection in the upper left cornerof the figure.You should not have anytrouble analyzing the front view; you knowthat the top is up, the bottom is down, theleft side is to the left, and the right side isto the right.In the top and bottom views, it’s easy to seethat the right-hand vertical line represents the rightside and the left-hand vertical line, the left side.But you might have to think a minute to realizethat the upper horizontal line in the top viewrepresents the back face of the block, while theupper horizontal line in the bottom viewrepresents the front face of the block. Note,also, that there is a line that appears as a visibleline in the top view and as a hidden line in thebottom view.In the right side and left side views, you canreadily see that the upper horizontal linerepresents the top of the block and the lowerhorizontal line, the bottom. But you may haveto think a minute to realize that the left-handvertical line in the right side view represents thefront face of the block, while the left-hand5-10
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