469 
brought successively to 0°, 30°, 60°, 90°, 120° and 150°, and each 
time I observed two stars which culminated to the north and two 
which culminated to the south of the zenith, as far as possible at 
the same zenith-distance. In order to eliminate the zenith-point one 
star was each time observed in each position of the instrument. Com- 
paring the differences thus obtained in the six positions between the 
latitude found by the northern and the southern stars yy—qs, with 
the corresponding differences formerly obtained at Chiloango (the 
mean zenith-distance in the Chiloango and the Matuba observations 
do not differ much, and in the 2°¢ determination at Chiloango obser- 
vations were made in the same 6 positions of the circle) I found a 
considerable abnormality in one of the positions of the circle which 
rendered the course of the results less simple than in the previous 
series. This made me suspect that the vertical circle might have 
become slightly deformed during the transport; a few local injuries 
were plainly visible, and it was possible that these. might have been 
accompanied by a very slight general deformation. 
In order to arrive at a greater certainty on this point, and as in 
any case it was desirable to check the results obtained by a new 
series of observations, | decided to undertake a second determination, 
and I accomplished this plan in 1914, from Febr. 22"¢ to March 14%. 
In this observations were again made in 6 positions of the circle, 
but this time the zenith point was brought to 15°, 45°, 75°, 105°, 
135° and 165°, and the number of observations in each position 
was doubled. Of the 8 observations 4 now concern northern, and 
4 southern stars, of which two were each time made in each position 
of the instrument. Each evening (i.e. in each position of the circle) 
the same 8 stars were observed. 
The results from both these series of observations are given below. 
For the sake of brevity I leave out the original readings of circle 
and level and the different reductions applied to them and give 
only the latitude gy according to each observation and thereby for 
each position of the circle the mean results from the 2 or 4 north 
and south stars yy and gs respectively, and also their differences 
and half sums gy—7vs and § (pyd-ys). The positions of the instru- 
ment are indicated in column P by the letters R= circle right of 
observer and L—circle left of observer. This was the simplest way 
of noting the observations at the time, but it leads to the same letter 
indicating a different position of the axis for a north and for a south 
star, and also NR and SL and similarly NL and SR referring to 
the same position of the axis. Column Z contains the zenith distance 
in full degrees, with the letters N (North) and S (South). 
