212 I. Р. Косн. 
1.90 sin 102900" x : i 
о 1) (cf. extrait of observation journal р. 206); 
11 
МЕНЕ. 
In а similar manner we get the other corrections: 
1.90 sin 180942" 
sin fvi == 
sin fyi = 4.0684 es == 00” 
. у 
. 1.90 sin 228°53’ 
sin = —— a LES 30” 
Le { 3.9991 } me 
. 1.90 sin 235755" 
sn = —________ ; we: 14” 
i { 4.3540 } = 
. 1.90 sin 236°13’ 4 
sin fix = — {4.2144 \ ох = — 20 
. 1.90 sin 263931 > 
siu [хи = æn ; [хп = + 42 
1.90 sin 295750" i 
sin fue =" Tann fø = +107" 
= 17.2225} Гм 
In order not to mistake the sign and to make sure against gross 
errors of calculation one ought, by means of a protractor, to draw a 
careful sketch of the station, such as indicated above (Fig. 27). When 
it is borne in mind that the graduation of the theodolite follows the 
same direction as that of the watch it appears at once that the correction 
of the bearing Instr.-VI must be positive (i. e. if one had had one's 
instrument placed on the cairn, the reading off for the bearing at 
Point VI would have become greater) and also that the other cor- 
rections must be negative. 
When the eccentricity of a station is computed, it is entered in 
the observation journal as shown on the table pp. 206—207, and after 
that the centred set is computed. 
The base net. 
In the group of triangles, of which the base net consisted, all 
the angles were measured. In this manner discrepancies arise, in 
that the sums of the angles of the single triangles should be 180%). 
To undertake an elaborate, systematic adjustment of the observations 
in order to comply with the geometric conditions would, however, 
be rather irrelevant. Considering the object of the triangulations, a 
1) { } shows that the logarithm has been indicated in stead of the corresponding 
number. 
2) In triangles as small as those of the base net the spherical excess is only just 
a fraction of a second; but even in the biggest triangles one may at a tri- 
angulation of this kind ignore the spherical excess altogether. 
