Orthographic Projections, ContinuedPosition of theWhen you see all six planes of projection with their respective images inprincipal viewsspace, they form a transparent, box-like structure in which the object itselfappears suspended in air. In third-angle projection, as the box opens, allviews rotate toward the observer as though they were hinged.The front viewalways lies in the plane of the drawing surface and does not rotate.Eachview has two of the three common space dimensions of height, length, anddepth and adjacent views supply the missing dimension. The relativepositions of the six principal views and their relationship to each other arelogically arranged on a drawing surface.Figure 6-26 shows the revolution and eventual position of the six principalviews in third-angle projection.Figure 6-26.—Revolution and position of the six principal views in third-angle projection.Continued on next page6-31
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