47 
magnitude in all points and mutually independent. The pointing errors 
must be added to the left side of the expressions (164) 
dry + dy, — dx, = dry, — ddo;; 
d 
dys + dy, — dy, = Ayo + 7 db; ; 
b 
(165) 
dx; + dz, — dx, = da; 4- dde, ii, 
d 
dys + dy, r^ dy, == do; + X db; ; 1 
After solving these expressions we find 
1 
da,; = — (dz; + da + dx, — dx; + dz, dep.) (166) 
1 
dys, = — (dys + dy; + dy, — dun, + dy,, — dy,,) (167) 
1 ; m 
dxiii177 3 1 (da, — dz, — day + day + day — dx,) (168) 
, 2 (1 4 3 6 5 
b 
db; |, — > d (dys — dys + dy, — dy,, — dy, + dy; (169) 
, 2 a 1 3 6 5 
Substituting (160)— (163) into (166)— (169) we find 
dxy, = hdp,, + ! (da, — dx, + dx, — dz) (170) 
1 b? + 2 d? d? hà — d? 
do; o" (05, 7:009. T 773 ) dus, py Qu. ls 5 des. | ET 
h? + d? 1 ; 
SEY do, À- — (dy,, — dy,, 4- dy,, — dyy,) (171) 
Z 1 U vig 3 6 5 
dn; ; = dug, + 55 (— da, + dx, + do, — dx; ) (172)