Chapter \ IT. 
The map of Iluwenzori is the chief geographical result of 
the Italian Expedition. This map was drawn up from data 
consisting of numerous angular measurements carried out by 
the Duke from the different peaks by means of the prismatic 
compass, which were completed by the mensuration of a base 
line of 300 yards taken on ground near to Bujongolo, by 
Commander Cagni, and by him connected with Kiyanja (the 
Edward Peak of Mt. Baker), and with a rocky peak (Cagni 
Peak) situated to the north-east of Bujongolo, from the 
summit of which Cagni himself took all the angles of the 
peaks with a field theodolite. 
Last of all, the calculation of the longitude and latitude 
of Bujongolo permits us to put the chain in its place on the 
map of Africa. * 
T1 le observations were taken in unfavourable atmospheric 
conditions, nor was it possible in all cases to take them with 
an instrument of precision so heavy, delicate, and cumbersome as 
the theodolite. In spite of these drawbacks the topographical 
sketch may be considered as fairly accurate, because it is based 
upon numerous observations often repeated over and over again 
at the same points, and which are in great part reciprocal, 
so as to admit of mutual verification one from another. 
The range of Buwenzori is situated less than half a degree 
north of the equator, and about 30° long. E. Greenwich. 
* According to the map annexed to this volume, Bujongolo is situated at 
0° 20' 23" lat. N., and 30° 1' 34" long. E. Greenwich. The numbers are 
a few seconds above those given on the map which accompanies the lecture 
of H.R.H. before the Italian Geographical Society, and published in Ease. 2, 
Part 2, Yol. VIII of the “ Bollettino,” because it was only later that he 
obtained from the Astronomical Observatory of Greenwich the necessary data 
for the correction of the lunar tables.contained in the ephemerids in order to 
assign its exact value to the straight ascent of the moon. 
