equal to the length of an element on the top view.

Figure 14-54 shows the following steps in the

Draw it with an altitude equal to the altitude of

triangulation of a warped transition piece joining a large

the corresponding element on the front view.

square pipe and a smaller round pipe:

The hypotenuse of the triangle is the true length

1. Draw the top and front orthographic views

of the element. In view C, the true-length

(view A).

diagram consists of only three right triangles.

2. Divide the circle in the top view into several

Since the piece is symmetrical, several elements

equal spaces and connect the division points

are the same length.

with the comers of the square (view B).

5. Draw the surface pattern by constructing one

3. Transfer the division points to the front view and

triangle at a time.

draw the elements. Some of the triangles curve

Figure 14-55 shows the following steps in

slightly, but they can be considered flat.

developing a rectangular transition piece that is not a

4. Now the true length of each of these elements

true pyramid because the extended lateral edges would

may be found. Draw a right triangle with a base

not meet at a common vertex. The best way to develop

14-34