Interior-angle traverses are used for many types of work, but they are especially
convenient for property surveys. Although interior angles could be observed either
clockwise or counterclockwise, to reduce mistakes in reading, recording, and
computing, they should always be turned clockwise from the backsight station to
the foresight station.The procedure is illustrated in Figure 9.1(a). In this text, except
for left deflection angles, clockwise turning will always be assumed. Furthermore,
when angles are designated by three station letters or numbers in this text,
the backsight station will be given first, the occupied station second, and the foresight
station third. Thus, angle EAB of Figure 9.1(a) was observed at station A,
with the backsight on station E and the foresight at station B.