OBSERVATIONS FOR TIME AND LONGITUDE. 
201 
To find Level Error the following readings were taken , Value of each 
division 1" *33. 
Level readings at East End 
,. .. 28*2 
At West End . 
. .. 3 r2 
28*1 
33'3 
Level reversed .. .. .. 
Level reversed 
.. .. 3 n 
28-3 
33 2 
Sum 112-8 
Sum 132-8 
112*8 
4) 20*0 
2) 5 *o 
4 the difference of ihe mean? ~ to the amount of deviation = 2-5 divisions. 
Value of each division .. .. ., .. r]j 
2-5 
665 
266 
5 ) mi 
3V66S 
Deviation in Time .= *222 = Sec. of Time. 
To find the Correction , due to level error , to he applied to observed time of 
Transit .— At Mitcham, on January 10th, 1894, a Orionis was observed to 
transit at lOh. 27m. 30*5 secs. The level error was 4-2*5 divisions of 
l"* 33 each, or in time 0*222 sec. The declination of a Orionis was 
7° 23' 19" * 2 N. Latitude of Mitcham 51° 24' 5" N. 
Lat. Mitcham . 
0 
/ n 
24 5 N. 
Declination a Orionis . 
•• •• 7 
23 19 2 N. 
Meridian Z. D. of a Orionis .. . . 
- .. =44 
oo 45*8 
l ' 
0-222 sec. 
T-346*53 
Z. D. = 44 0 0' 45*8" . 
9-856840 
Decl. 7 ° 23' 19-2" . 
0-003621 
Correction — 0*161 sec . 
1*206814 
The West end of the axis being too high, the correction is 4 -; 
we get—- 
H. M. S. 
therefore 
Obsd. Time . 
27 30*5 
Correction . 
+ O’ 16 
CoiTWt Time of star’s Transit .. ,, zs 10 27 3©? 66 j 
