OBSERVATIONS FOR TIME AND LONGITUDE. 165 
meridian distance will be East, because we must have travelled East to 
reduce a fast error on the local time of the first station ; but, if it is more 
fast at the second station, the meridian distance will be West, because 
we must have travelled West to increase a fast error on the local time of 
the first station. 
Fast and sloiv errors combined .—When the watch at first station has a 
slow error on local time, and a fast error at second station, the meridian 
distance will be West, because we must have travelled West to have 
changed a fast error on the local time of the first station to a slow one at 
the second station; and when the watch at first station has a fast error 
on local time, and a slow error at the second station, the meridian distance 
will be East, because we must have travelled East to change a fast error 
on local time at the first station to a slow one at the second station. 
If provided with a compass, a traveller should, in all cases, know if he 
had been making Easting or Westing. 
The following are examples of these three cases;— 
Example 1, 
E rcr of Watch at Mom! asa, 8 a.m., 14th of July 
„ „ ,, 9 A.M., 2cth „ 
Interval 6-04 d »ys 
Error of Watch at Taveta, 4 p.m., July 25th 
„ „ ,, 8 a.m., July 30th 
Interval 4 67 days. 
Difference = 
IT. 
. . 2 
M. 
18 
, s. 
32 slow. 
. . 2 
17 
14 » 
ierence = 
= I 
18 
6-04) 
78 
rate ^ 
12*91 gaining. 
IT. 
M. 
s. 
2 
8 
5 slow. 
6 
48 „ 
i 
17 
r*7) 
77 
Daily rate .. .. 
Dormer daily rate 
16-5 gaining, 
I2’9 „ 
2)29-4 
Mean daily rate. 14-7 u 
H. M. S. 
Error of Watch at Mombasa, July 20th, 9 a.m. .. = 2 17 14 slow. 
5-3 days’ mean rate.- 1 18 gaining. 
Error of Watch at Mombasa, July 25th, 4 p.m. .. ^ 2 15 56 si w. 
» » Taveta, „ „ ..=285 
Meridian distance, or difference of Longitude between) 
Mortxbasa and Taveta , f ,. . ? ,. ., .. j “ 7 5 1 — 1 ^ U 
