63 
Then we substitute the expressions (247)—(249), (176), (177), and 
(180) into (246). After some rearrangements we find 
n D? 
Qu = gz 2% + 1) (250) 
nn 6d? 
similarly the weight number of the last term of (245) is determined as 
n D? 
Q7 ta - ap (2 n 4- 1) (n + 1) Quy (251) 
Special attention has to be paid to the weight number Qgg. dH of 
expression (245) is defined as dH — dh' + dh” or as the sum of two 
elevation measurement errors in the transfer points. Consequently the 
standard error my can be expressed as 
/ 
— A DJ OK 
My = 9, y2 (252) 
where m, is the standard error of one elevation measurement. But 
h 
dh: = 5 dp, (253) 
where dp, is the error of the x-parallax. Consequently 
h 
my —cym, (254) 
From (258) and (260) we find 
h 1]/ . 
my = + | 2, (255) 
If the x- and y-parallaxes are measured in the same manner the factor 
m,, of (255) ean be substituted by the standard error s, of the y-parallax 
measurements. Above, however, we have assumed that the y-parallaxes 
are measured monocularly and the x-parallaxes stereoscopically. Then 
we have the relation 
m, = = (256) 
ere 
AT ERP TS 
  
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