( 370 ) 
| IEN dA + METEN Dn E HEN 
(31 
2D (%) Jaa + [Ge = rel), 
They are of course identical with the equations (20) and (21) if in the 
Ee an 
reduction of these we treat the quantities 0 as quantities of the 
Vo 
order of dA and dD. 
b. Method of ARGELANDER. 
If we reduce to unity of weight, the equations of condition (24) 
may be writen 
(32) psind, =0 
or by writing 
pons (t) a+ %) rans Ets + 5), 
(33) sin ho (4). dA + sin hg (4) ap = — po sin Àg » 
which lead to the normal equations: 
| eten), laar sin? 2) SE i lean dD=— sina, (4) 2 | 
| sine ee 5). G x) | dD Vai 1G |ab=— ain? À (54) ” | 
whieh again will be identical with (26), if we treat the quantities 
po as of the order of dd and dD, 
(34) 
c. Method of Koso. 
By introducing 
sin A = sin À, eee de en dA + cosh, & dD 
sin p = sin py + cos po <4 dA + cos py (5) de 
0 
the equations of condition (29) become 
