I. —Astronomic Observations. 
Here Nos. 2 and 3 point to irregularities in their movement. For this reason, 
and also because the daily comparisons were occasionally omitted, it was 
considered desirable to make use only of the indications of the No. 1 
chronometer, which was in fact the one generally employed for the observations. 
With the view of fixing, if only approximately, the daily correction of the 
No. 1 chronometer for the period of the journey, the calculation of the 
astronomic elements of Bujongolo was taken in hand, and here were recorded 
determinations of time between 11th and 28th June, taking the latitude at 
= 0° 20' 16" N., roughly obtained from the already determined elements. 
The corrections of the No. 1 chronometer on the mean local time were for 
Bujongolo : 
11th 
J une, 
3 h 
40 m * . 
Ohs. No. 32 
— + 5 h 
15 ra 
39 s - 1 
3 
43 
„ 33 
„ = + 
39 • 1 
3 
48 
„ 34 
» — + 
35 • 5 
- 
3 
49 
„ 35 
» = + 
34 • 6 
26th 
19 
19 
„ 37 
,, = + 5 
15 
33 • 2 
19 
23 
„ 38 
» = + 
31 • 9 
27 th 
>> 
19 
38 
„ 39 
>> = + 5 
15 
29 • 9 
19 
43 
„ 40 
n = + 
32 • 0 
28th 
5) 
20 
23 
„ 41 
,, = + 5 
15 
26 • 8 
20 
27 
„ 42 
>> ~ + 
29 • 4 
From the mean of the results for 11th and 28th June respectively, we 
get, omitting the intermediate observations : 
11th June, 3 h 45 m C tm = -+- 5 h 15 m 37 s ’l 
28th „ 20 25 „ = + 5 15 28 T 
Interval 17 days 16 h 40 m Difference 9 s- 0 
Hence : B = - 0 s- 509. 
The change occurring in the mean daily correction of this chronometer is 
seen to be considerable, if the value just found be compared with that previously 
obtained at Entebbe (-2 S, 762). But now we merely require an approximate 
value of the longitude of Bujongolo for the calculation of the emersion of 
B A C 81, and this will give us the absolute longitude of that same point. 
Hence we take the by no means arbitrary course of adopting, as mean daily 
correction of the No. 1 chronometer during the journey, the mean of the two 
daily corrections obtained at Entebbe and at Bujongolo, that is to say : 
Bi = 
2 s -762 + 0 s -509 
2 
P-635 
* The date is astronomic, and the hour is referred to the mean local time . 
311 
