The essentials of descriptive geometry . and elevation of an hexagonal pyramid whose base is2 in diameter and whose altitude is 3. The apex of the pyramid is directlyabove one corner of the base. Note: Unless otherwise specified objects given in problems are to bedrawn in the third quadrant; and when no distance from H and V is giventhe views may be located at any convenient distance from the ground is well, however, to keep the distance between views relatively short sothat the eye may readUy note which points are projections of each other;in practical drafting only enough space is al
The essentials of descriptive geometry . and elevation of an hexagonal pyramid whose base is2 in diameter and whose altitude is 3. The apex of the pyramid is directlyabove one corner of the base. Note: Unless otherwise specified objects given in problems are to bedrawn in the third quadrant; and when no distance from H and V is giventhe views may be located at any convenient distance from the ground is well, however, to keep the distance between views relatively short sothat the eye may readUy note which points are projections of each other;in practical drafting only enough space is allowed between views to permitof placing dimensions and to keep the views distinct. CHAPTER II PROFILE PLANE II. While in many cases a plan and elevation will show theshape and size of an object it quite frequently happens that athird view will be required for a complete representation. Insuch a case the H and V planes of projection are not suf&cientand a third plane of projection must be added. The third view,which is most commonly. ,H. Plane. used to supplement theplan and elevation, iscalled an endview, or aside or end elevation, ora profile projection; andthe plane upon whichthis view is made iscalled the profile plane,or P plane. 12. In Fig. 8 is showna picture of the arrange-ment of H, V, and Pfor the third this picture it willbe clear that the profileplane is perpendicular to the G. L., and therefore to both Hand V, and it may be located at any convenient point on theG. L. and on either or both sides of the object. In case it islocated on the right side of the object the view obtained will bethe right end view. It not infrequently occurs in drafting thatboth end views are shown. 13. In Fig. 9 is shown how the H, V, and P planes, pic-torially represented in Fig. 8, appear when they are revolved to Fig. 8. 12 ESSENTIALS OF DESCRIPTIVE GEOMETRY coincide with the plane of the drawing. From this figure it willbe observed that thtf relations between H and V which
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192400462, bookyear1915
