C 920 ] 
The operation for the preceding example will be 
this : 
Tang. £CBD — 9.273225 
Cof. BC — 9.291504 
Cotang. BCD — 9.564729 
BCD = 87* 53' S*' 
Sine j CBD — 9.265714 
SineBC — 9.991524 
Sine j CD — 9.257238 
f CD = io° 25' 2{" 
i 
A D = 4°3 5 
AC = 35 53 
C D = 20 50 
Sum = 99 48 
g Sum = 49 54 
Sum — AD = 6 49 
// 
o 
o — 0.232001 7 
5 — 0.4489505 
5 
2 ? — 9.883621 
2 \ — 9.0744665 
Sum — 19.639038 
Sum — 9.819519 
ar.co. of the fines. 
fines. 
This half fum is the logarithmic cofine of half 
ACD; therefore, half A C D is = 48° 42' 1 1 ", and 
its difference from \ BCD will give { ACB = 
4° 4 5 1 f "• 
Sine of i ACB 
Sine of A C — 
Sine of B C — 
8.918444 
8.9 18444 
9.767999 
9-99i5 2 4 
0.0039483 — log. — 7 - 59 6 4 x 1 
2 
0.0078966 
0.7333345 — natural eofine of BC — ■ AC, that is, of 42° 50'. 
0.7254379 — natural cofine of AB, 01 fine of the latitude. 
Therefore, the latitude is 46° 30' 19". 
But farther, as in the cafes, where the above ap- 
proximation takes place, it is an advantage, that the 
affumed latitude fhould be taken as near the true 
one. 
