There is a geometric construction for laying off, on another part of the same drawing or on a different drawing, an angle equal in size to one that is already drawn. This procedure, called transferring an angle, is shown in figure 4-10. Here, the draftsman desired to lay off from O´ a line that would make an angle with B´O´ equal to angle BOA. To do this, draw an arc through OB and OA, with O as a center, as shown in figure 4-10, view A. Then, draw an arc of the same radius from B´O´, with O´ as a center, as shown in figure 4-10, view B. Next, measure the length of the chord of the arc between OB and OA and lay off the same length on the arc from B´O´, as shown in figure 4-10, view C. A line drawn from O´ through A´ makes an angle with B´O´ equal to angle BOA, as shown in figure 4-10, view D.
(Source: NAVEDTRA 14069, U.S. Navy)
