THE TRANSIT 
83 
they may be more than 180°. The magnetic bearings 
may be used to figure out the angles as a check on 
measurement; they also help to locate an error if one 
exists, but a more accurate check is the sum of all the 
angles which should equal twice as many right angles 
less four as the figure has sides. 
Computed bearings are worked out by applying the 
angle measurements to the bearing of the first line. Com¬ 
puted, not observed, bearings should be used for plotting 
or for computing traverse. Notes may be kept as follows: 
AVotes of Survey of F/e/c/ 
Sfa. 
fnf. fnq/e 
Observed 
Bear/r/d 
Computed 
Bear/dd 
D/sfcmce, 
i 
0 
7V87°£ 
7/8/°£ 
SJ 8.63 ft 
J 
/ 
263° /S' 
N8°/S'W 
TV 8°79'W 
48.79 " 
2 
3J°S2 
N7S45E 
A/73°49'E 
3 00. S3 n 
3 
8S’/2' 
S9°30£ 
S3°j23£ 
783.60 " 
4 
3/°28‘ 
S73°/SW 
373 S'W 
8/3.36" 
S 
d6°J6' 
A/7°4SYV 
TV 7°47 W 
734.8S" 
0 
3/°73' 
7V87£ 
Sketch of Survey 
Instead of interior angles, deflection angles may be 
read, a deflection angle being the angle which any course 
makes with the prolongation of the one preceding. To 
get this, after the instrument has been turned on the rear 
point, revolve the telescope-on its axis and turn to the point 
ahead. The deflection must be recorded as right or left, 
