DEGREE. 
R ” 
A—A’= ated 
4 
In Table VI. with middlelat.A A’= ae ees aus 
= 545480 
A — A’ = 1226.5 = 3.0886695 
== 20! 26", 5 eae 
rf, 2d. 
In Table ITT. with lat. A’ take 0.3707524 7.83569 
Add loz. y? 0.965 1000 0.96510 
Tang. LD - oo. 0930983 
, IRs corr. == 26".88 = 1. 14295507 o” 06=28.! 8.80079 
A’=20' 26".5 
A 
Sum of rand2= 26.94 
20 53 44=-diff. of lat. between A and B. 
st 28 4 
51 7 sx_ 7 46.56 es Latitude of Dover-cafle, 
Example 1V. 
¥ 3 “A. ae lat. 50° 398" ZAA’AB=e=81" 56153". 
Required the latitude and longitude of B, Beachy-head ? 
In Table VI. with iat. 50° 40’, take 7.99415 
Log. x 4.6770 
469%.08 = 7 12 
== 9! 49" 08 
which added to 50° - 
gives the lat. of A’ oF 44 5 57 , es 
In Table III. with lat. A’, take 0.3707679 
og. y®  1.0528130 
Tang. L. 0.0877597 
a ae me 145113406 
wee en ee ee 
in Table IIL. 2d. part with lat. A’, 4.8 
Log. y? 
ft. corr, « “ 
2d. corr. - + 0.077 = 8. eto 
The total non a oi taken from the lat. A’, leaves” 
50° 24". 
the lat. B = 
—2 
cA 
? 
Zo find the Difference of Longitude 
tang. *I..) 
Log. 3 = 9.52288 
= 6.41016 
Tang. L — 0.35104 
ES eee 
6.28408 = 0,000192 
9-99996 = 0.999808 
Vor. XI. 
Brought over 9 99996 
RY = 5.33442 
1. 8.20508 
Co. cof. L. = 0.19874 
ne at ee 
BY a! 6° .Bss 6225 Gee 3-77517 
To find the Difference of Azimuth. 
2 x 
z'== go? — tang. L + 4 tReet ar tang. L (4 + tang.* 
L.) 
Ry 
a 
= 3.5195179 Tang? L = 0.175952 = 1.49 
+5 
Tang. L = eens Log. 0.30059 = 1.99 
4049", +3 = 9,6073650 
Log. + 
ne 
ee 31442 
yx 
in 4 cn 
Tang. L = 0.08775 
9+54029 
0.30059 
0.69 = 9. eqoak 
Log. (tang. L + 4) 
If in this example the noitial a be taken from a€iual ob- 
fervation, log. .32288, the difference of longitude 
will then be found 1° 26’ 47", very nearly the fame as in 
the trigonometrical furvey. 
Note. To the log. of normal in feet, add the conftant log.~ 
7-4637260, and it will give the number of fathoms in the 
ree. 
nd to the log. of number of fathoms add the conftant 
log. 2.5362738, and it will give the log. of the normal. 
, Example V 
Let the latitude of A, Dunnofe = 50° 37° 7".3 
“== 27001 
13072 = §-4956443 
Required the latitude a longitude of Blackdown? (Vid. 
j fe ii p. 91. Faden’s edit. 
A’ ihypo thefis ig 50° 4y’ 41", 5 
ut by the meafured pe of 60850 feet 5O4I 42.1 
5040 42.5 
28.1 
g. L 0.0869004 “ 
Lat. A’,A, ret T1I, 0.370771¢ . 
Log. y? 0.9912886 
28.11 = 1.4489605 
Lat. B= 50 41 14 
To find the Difference of Longitude. 
OS: F = 6522 
Z = 0 99129 
= 5+35737 
Tang. "lL = 217380 
Log. (1 — (4 x tan? L) == 6.04534 =3 O.OOOIIE 
Log. 1 — 4 ve L §8 
g- 3 an.” L = 9.99995 = 9.999889 
Uu Brought 
