Descriptive geometry . Fig. 33. Fig. 34. VN Fig. 45 VN Fig. 35. Fig. Fig. 47. Fig. 48. CHAPTER II POINTS, LINES, AND PLANES 20. Three distinct operations are requiredfor the solution of problems in DescriptiveGeometry. First, a statement of the Principles in-volved. Second, an outline of the Method to beobserved, by the enumeration of the stepsnecessitated. Third, the graphic Construction of theproblem. The first two operations are purelymental, and the last is the mechanical opera-tion of executing the drawing. 21. To determine three projections of a The projections of tw
Descriptive geometry . Fig. 33. Fig. 34. VN Fig. 45 VN Fig. 35. Fig. Fig. 47. Fig. 48. CHAPTER II POINTS, LINES, AND PLANES 20. Three distinct operations are requiredfor the solution of problems in DescriptiveGeometry. First, a statement of the Principles in-volved. Second, an outline of the Method to beobserved, by the enumeration of the stepsnecessitated. Third, the graphic Construction of theproblem. The first two operations are purelymental, and the last is the mechanical opera-tion of executing the drawing. 21. To determine three projections of a The projections of two points of a Une determine the projections of the , 1. Determine the vertical, hori-zontal, and profile projections of two points ofthe line. 2. Connect the vertical projectionsof the points to obtain the vertical projection of the line; connect the horizontal projectionsof the points to obtain the horizontal projec-tion of the line ; and connect the profile pro-jections of the points to obtain the profileprojection of the line. Construction. Figs. 49 and 5
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