Let A B D E of Fig. 365 be the elevation of the article, and F N O I the plan at the base, K M P L being the plan at the top. If the sides are to be developed in connection with the top (supposing the bottom to be open) proceed for the pattern as follows: Draw K1 M1 P1 L1, Fig. 366, equal in all respects to K M P L of the plan. Through the center of it, and at right angles to each other, draw lines V U and S T indefinitely. While the elevation in Fig. 365 shows the slant hight of the ends it does not give the slant hight or profile of the sides, therefore through the elevation, and perpendicular to the base and top, draw the line C G, which will measure the straight hight of the article. From G set off G H, in length equal, to M R of the plan. Draw H C. Then H C will be the profile of the article through the side, and therefore the width of the pattern of that portion. Upon V U of the pattern, from K1 M1, set off W V, and from L1 P1 set off X U, in length equal to H C of the elevation. Through U and V draw lines parallel to K1 M1 and L1 P 1, making them in length equal to F N and I O of the plan, letting the points V and U come midway of their lengths respectively. Draw K1 F1, M1 N1, L1 I1 and P1 O1, thus completing the pattern for the sides. Upon S T set off Z T from M1 P1, and Y S from K1 L1, in length equal to A B or D E of the elevation, and through the points S and T draw F2 I2 and N2 O2 parallel to K1 L1 and M1 P1, and in length equal to F I and N O of the plan, letting the points S and T fall midway of their lengths respectively. Draw F2 K1 I2 L1, N2 M1 and O2 P1, which will complete the pattern of the ends.
Fig. 365. - Elevation and Plan.
Fig. 366. - Pattern.
The Pattern of a Flaring Article of Which the Base is Oblong and the Top Square.
If it is required to produce the pattern with the sides joined to the bottom, supposing the top to be open, lay out first a duplicate of F N I O, through the center of which draw the stretchout lines V U and S T as before, and proceed in the same general manner as described above to obtain the sides, placing then-wider ends against corresponding sides of the base or bottom.