Let K H G W L in Fig. 297 be the elevation of a pedestal octagon in plan, of which the pattern of a section is required. This elevation should be drawn in such a manner that one side of it will appear in profile. Place the plan so as to correspond in all respects with it. Divide the profile G W, from which the plan of the side desired is projected, in the usual manner, and from the points in it drop points upon each of the miter lines F T. and P U in the plan. Lay off a stretchout, B E, at right angles to the side of the plan corresponding to the side of the article shown in profile in the elevation, and through the points in it draw the usual measuring lines. Place the T-square parallel to the stretchout line, and, bringing it successively against the points dropped upon the miter lines from the elevation, cut the corresponding measuring lines. A line traced through the points thus obtained will describe the pattern of one of the sides of which the article is composed. In cases where the profile is complicated, consisting of many members, and where it is very long, confusion will arise it all the points are dropped across one section of the plan, as above described. It is also quite desirable in many cases to construct the pattern in several pieces. In such cases methods which are described in connection with Problem 18 may be used with advantage. In the present case the pattern is constructed of two pieces, being divided at the point 8 of the profile. The lower part of the pattern is cut from the plan drawn below the elevation, while the upper part of the pattern is cut by means of a part of the plan redrawn above the elevation, thus allowing the use of the same profile for both. The same letters refer to similar parts, so that the reader will have no difficulty in tracing out the relationship between the different views.
Fig. 297. - The. Patterns for an Octagonal Pedestal.