479 
The values found for the magnetic coordinates of Matuba observ.- 
pier with respect to Landana flag staff follow here, and subjoined 
the astronomical coordinates calculated from them by means of the 
magnetic declination. 
Matuba with respect to Landana 
KR ate et asOr Oat: A Hog == 7g mod 
AES ADs a ggOBmd 4 
Adding to the latter the coordinates of Landana with respect to 
Chiloango observation-pier and taking the latier point as the zero 
point of coordinates we obtain: 
Landana flag staff Y= JH 68629 Y = — 230852 
Matuba observ. p. X= -+ 3777.93 Y = — $003.93 
If these are reduced to seconds of are with the reducing factors : 
1” in the direction of the meridian = 30714 
LENTES cd RD VE zin U) 
we find for the difference of latitude and longitude between Matuba 
and Chiloango and by means of these for the geographie coordinates 
of Matuba: 
Matuba—Chiloango Ay=— + 5315 AA = — 2' 2"7 
Chiloango g—=—5°12' 4720 4= — 12° 8' 4"5 
Matuba Obs. pier (p= — 5°16" 57"4 A eye 1210772 
The latitude of Matuba derived from that of Chiloango thus differs 
by 17.7 from the value as directly determined. This difference may 
be explained by accidental errors, in the first place by those made 
in the tacheometric measurement. It is also possible that in this case 
local attractions played a part. Not long ago (May 1913) at Matuba 
a few hundred metres to the south of my observation-pier considerable 
land slides took place. 
However this may be, according to the above ealeulation we 
may assume: 
Longitude of Matuba Obs. P. —12°10' 7".2 
— — 0'48"40:.48. 
b. Determination of the Longitude of Cabinda. 
As regards the determination of the difference of longitude between 
Cabinda and Matuba, it seemed to me most suitable to deduce this 
from the difference of latitude and an azimuth determination. 
For this purpose I placed at Matuba at a distance of about 200 m. 
from my observation-pier a signal on a tripod, which was visible 
