-21- 
coordinates and elevations of the critical points (the end points of 
the baselines and the points for which the elevation is terrestrially 
determined), the following discrepancies in the quasi-observâtions can 
be determined: 
AS 
- s t 
_ s 
(ii)* 
A K 
- K T 
- K 
(12)* 
A H 
- 
_ n 
(13)* 
A 
= «V 
_ 
(14)* 
Based on the generally accepted assumption that the propagation 
of errors of the various elements of orientation seem to have a 
systematic appearance, it could be deduced that the propagation of 
errors in the quasi-observations is also systematic in appearance.** 
Figure 7 shows schematically the propagation of the errors in the four 
quasi-observations. 
The elements of the quasi-observations, as shown, in Figure 'J, 
are as follows: Initial errors (dS dK , d Cd and d CD) and 
o 7 o ° / O 
differential errors (increments per model) in the quasi-observations 
(Ss,d AK„d/\CO J di'y)- These elements can be determined from 
Figure 7 with the knowledge of the error in the quasi-observations 
(dS| > dS^ ;dK|; dK^ , d (J>| dO^ > d Pi | and diBX)) of the end bases 
B| and as well as representative X values for the two bases 
( X| and ) • 
* could be deduced thru a terrestrially determined distance. 
could be determined thru the terrestrially determined azimuth of 
a line. 
.Q-r-and could be determined thru terrestrial measurements of 
distances and elevations. 
**For details, refer to Bibliography, Entry 5 or 9*