In Fig. 500 is shown a side view of a scale scoop by which it will be seen that the portion A B G H of the funnel-shaped end is a simple cylinder and, therefore, need not be further noticed here. In Fig. 501 are shown a side and an end elevation of the tapering portions. It will also be seen that the part D E F of the side view is similar in all respects to the article treated in the preceding problem, and the pattern shown in connection with the same is obtained by exactly the same method as that there described and need not, therefore, be repeated.
An inspection of the side elevation will show that the part G B C D F is a section of a cone of which I is the apex, H F the base and H' C" F' the plan of the base, and that this cone is cut by the lines B G and C D. To obtain the pattern of this part, first divide F' C" and C" H' of end elevation into any convenient number of parts, and from the points thus obtained carry lines cutting the miter line H F, as shown. From the points in H F carry lines to the apex I, cutting the curved line C D, as shown. From the points in C D drop perpendiculars cutting the sides G F, as shown. For convenience in describing the pattern a duplicate of the side view of this part is shown in Fig. 502, in which similar parts are lettered the same as in Fig. 501. With I of Fig. 502 as center, and I G and I F as radii, describe the arcs R S and P Q. Upon P Q lay out twice the stretchout of H' C" F' of Fig. 501, if the pattern is desired in one piece. Thus the stretchout of H' C" is represented by P U and Q W, from the points in which draw lines to the center I. From I as center, and radii corresponding to the distance from I to each of the various points in G F, describe arcs cutting lines of similar numbers. Trace lines through the points thus obtained, as shown by T U, V W. The R T U W V S is the pattern for part of scoop shown in side elevation by BCDFS.
Fig. 500. - Scale Scoop, One End of which is Funnel Shaped.
Fig. 501. - Side and End View of Conical Portion of Scoop, with Pattern of Piece D E F.
Fig. 502. - Pattern of Piece B C D F G of Fig. 500.