I.— Astronomic Observations. 
get, taking account of the difference of longitude between Bujongolo and 
Entebbe (+9™ 45 s ), the daily mean correction K x = — 2 s- 123, which we shall 
utilize for the determinations of position made in the period from 11th May to 
11th June. 
Owing to an unforeseen circumstance, on the return journey, and after the 
arrival of the expedition at Fort North Portal, the No. 1 chronometer under¬ 
went, like the others, a perceptible change in its movement. This was due to a 
considerable delay which occurred in winding it, so that once it was necessary 
to proceed to the revision of the longitude of Fort Portal which had been 
determined on the outward journey. On the return, the conveyance of 
Greenwich time from Bujongolo will be limited to this intermediate point, 
since, owing to the above-mentioned change in the movement of the chrono¬ 
meter, it would be impossible to convey said time to Entebbe for purposes of 
control. 
Retaining the value of the daily correction just found (K T = — 2 s • 123) 
as a quantity proportional to the time, and with the (approximate) latitude of 
Fort Portal = 0° 39' 20" N., we get the value of the longitude from four series 
of altitudes (Obs. Nos. 17, 18, 19, and 20), obtaining : 
and as mean : 
Fort Portal.—31st May. 
55 51 
5? 15 
1) 51 
Fort Portal ... 
A = 2 h l m 32 s -2 E.G. 
55 
55 
55 
31 -8 
31 -1 
34 -7 
55 
51 
55 
A = 2 h l m 32 s -5 E.G. 
a value which is adopted as the longitude of said place. 
The latitude of Fort Portal is obtained from a series of three circum- 
meridians observed on 31st May, and from meridian altitudes of 22nd and 
28th July (Obs. Nos. 21, 22, 23, 75, and 86). The mean of the five results 
yielded for: 
Fort Portal ... ... <£ = 0° 39' 28" N. 
a value which differs little from that employed for the calculation of the 
longitude. 
Using the longitude just found, 
we get the absolute 
correction of No. 1 
chronometer at Fort Portal (return 
observations, as under : 
journey) by means 
of eight series of 
Fort Portal.—21st July, 4 h ll m .. 
.Obs. No. 73; K x = 
+ 3 h 15 m 16 s - 1 
„ 4 18 
» 74; „ = 
15 -9 
,, 19 53 
,, 76 ; „ = 
17 -5 
,, 19 55 
>) ^ 7 ; ,, = 
16-5 
315 
