200 
HINTS TO TRAVELLERS, 
Example. 
August 17th, 1899, the transits of the ])| and the * B. A. 0. 6550 were 
taken over three wires of a transit theodolite to determine the longi¬ 
tude of the place; times being taken by an ordinary watch. 
Transit of ])| 
h. m. s. 
Mean of the Times 8 49 57*8 
Transit of % 
H, M. S. 
Me-u of the Times 9 20 35*0 
Obsd. Local M. T. of Transit of) 
H. M. 
f) „ 
B. A. C. 6550 .. . ] 9 
Obsd. Local M. T. of Transit , 
of 3 >l . 
Mean Time Interval. 
Acceleration .. . 
Sidereal Interval 
8 49 
= o 
35’ o 
57*8 
3 7*2 
5 ‘o 3 
s= o 30 42*23 
Greenwich Transit of B. A. C. 
6550 on Aug. 17th, 1899 [3^'s 
R.A. (ol. 4, “ Moon-Cul¬ 
minating Stars " (N.A.)] .. 
Sidereal Interval — because } | 
transits before star .. .. / 
R.A. of })| at Transit at Place 
Nearest R.A. of })| (col. 4 N.A,) 
Diff. of R.A. = C. = 
H. 
M. 
s. 
19 
3 
55' Jo 
30 
4^*23 
18 
31 
13*07 
18 
32 
4 r *°5 
0 
32-02 
2 preceding R.A. of J)| • 
2 following lLA. of 2 >| j j 
1 Aug. 
1 Day. 1899. 
IT. 
M. 
s. 
1st Diff. 
1 16th L. C. 
18 
O 
15-87 
M. S. 
1 17th U. C. 
17th L. C. 
18 
n 
4 3 '°5 
+ 32 25*l8 
19 
5 
4*68 
A 4- 32 23*63 
- 18th U. C. 
3 9 
3 7 
14 '35 ! 
4 * 3 2 9-67 
2nd DifF. 
secs. 
- 1 '55 
- 13-96 
2) 15*51 
B = - 7*75 
Constant Log. 
A in seconds 
C 
: 1943*63 Ar. Co. Log. 
32*02,. .. Log... 
— 4*635480 . 4*635480 
= 6*711387 .. .. 6*711387 
=3 1*505421 Equation from table XXII. 
8 . 
= o*i log. T cooooo 
Approx. Longitude 711*71.. = Log... 
Correction .. .. — 2*22 
= 2*852288 Correction-2*22 = Log. =2 0*346867 
Longitude in Time = 709*49 = 2 57 22 W* 
* The Longitude is West because the ])’s at Transit at place is greater than the ])’s at the 
nearest U. C. (upper culmination) at Greenwich (which in this case was oh. 45m. 54*398.). If the 
D’s JR at Transit at place had beep legs than the rarest ff. C, at Qreepwicb, the Eongitnde would 
have been East. 
