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101
INTERSECTING RECTANGULAR PRISMS
MK, set off a distance equal to MK on the other side of the miter line. Letter this point N. The straight line GN will form the angle NGB, which will exactly equal the angle HGB. Make the line GF equal in length to line BC. Draw the line CF, which is the second miter line of the elevation.
Figs. 137-141.—Rectangular Pipe Offset.
The elevation is completed by drawing lines DE and EF.
The Pattern.—There are two methods of construction in general use in shop practice. One method calls for each piece to be developed separately, Fig. 139, the other calls for the body of the fitting to be made as shown in Fig. 140, the ends being "double seamed in." Figure 139 shows the patterns for the offset laid out in
