Descriptive geometry . TP, and to be re-volved to the right about VF as an axis untilit coincides with V, Continue A^ until itintersects VP in/% which is the vertical pro-jection of the profile trace. Continue A^ untilit intersects HP in /^ which is the horizontalprojection of the profile trace, revolve to GrL^using the intersection of HP with GrL as acenter, and project to f^ by a line drawn TRACES OF A LINE 17 through/parallel to GrL. This is the profileprojection of the profile trace. Fig. 53 is the oblique projection of the line,and clearly shows that the line passes fromone quadrant to an
Descriptive geometry . TP, and to be re-volved to the right about VF as an axis untilit coincides with V, Continue A^ until itintersects VP in/% which is the vertical pro-jection of the profile trace. Continue A^ untilit intersects HP in /^ which is the horizontalprojection of the profile trace, revolve to GrL^using the intersection of HP with GrL as acenter, and project to f^ by a line drawn TRACES OF A LINE 17 through/parallel to GrL. This is the profileprojection of the profile trace. Fig. 53 is the oblique projection of the line,and clearly shows that the line passes fromone quadrant to another at its vertical andhorizontal traces, line A passes from IQto 5 § at its vertical trace, c, and from i^ to 4Q at its horizontal trace, d. Note. The vertical projection of the verti-cal trace of a line is often called the verticaltrace of the line, since this trace and its ver-tical projection are coincident. Likewise thehorizontal projection of the horizontal trace iscalled the horizontal trace of the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectgeometrydescriptive
