166 
HINTS TO TRAVELLERS, 
and as the watch is less slow at Taveta than at Mombasa, Taveta is west 
of Mombasa. 
O I // 
The Longitude of Mombasa being .39 40 00 E. 
Meridian distance, west. .. .. 1 57 45 W. 
Longitude of Taveta .= 37 42 15 E. 
Here we have supposed the rate to be obtained at both places. If, 
however, it was only ascertained at one end, that rate would have to 
be used. In the case supposed the result would be a difference of 10 
seconds in the determination of the longitude of Taveta, or 2' 30" of 
longitude. 
Example 2. 
June 15th, 9 a.m.— Error of watch at Manos.3 56 20 fast. 
June 20th, 3.56 p.m. ,, ,, .. 3 58 10 „ 
Difference = 1 50 
days. secs. 
Interval: 5 • 29 ) 1 io*oooo (20" •79 = daily rate gaining. 
105 8 
4 2CO 
3 7°3 
4970 
47 _ 6 j 
ir. m. s. 
June 27th, 4 p.m. —Error of watch at Concacao .. .. 3 48 5 fast. 
July 3rd, 8 a.m. ,, ,, „ .... 3 ^9 58 
Difference = 1 53 
days. secs. 
Interval: 5*66 ) 113*0000 (19" *96 daily rate gaining. 
56 6 
56-10 
5094 
5460 
5094 
3660 
3596 
n 
Daily rate at Manos.20*79 
,, ,, Concacao .19*96 
2)40*75 
Mean daily rate = 20*37 
