Engineering Descriptive Geometry a Treatise On Descriptive Geometry As the Basi
Engineering Descriptive Geometry a Treatise On Descriptive Geometry As the Basi
F W Frank William Bartlett
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In the same way PH and PS meet at & on the axis of Y, and PV and PS meet at c on the axis of Z. The descriptive drawing, Fig. 95, is obvious from the explana- tion of the. Perspective drawing. From Fig. 95 it is evident that if two traces of a plane are given the third trace can be determined FIG. 96. FIG. 97. by geometrical construction. Thus, if PH and PV are given, PS may be defined by extending PH to b on the axis of Y and extend- ing PV to c on the axis of Z. The line joining ~bc is the re...quired trace of the plane on . If any two points on one trace are given, and any one point on a second trace, the whole figure may be com- pleted. Thus any two points on PH define that line and enable a and b to be found. A third point on PV, taken in conjunction with a, defines PV, and enables c to be located. Be, as before, defines the trace PS. This is an application of the general prin- ciple that three points determine a plane. PLANES OF UNLIMITED EXTENT: THEIR TRACES 111 100. Traces of an Oblique Plane: One Trace "Negative.
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