Scale 
(select A and B in the 
y-direction as sym- 
metrically to NN as 
possible and below 
KM). 
Common lateral tilt 
(Azr—a stands for the 
elevation difference on 
the line F—A to be 
eliminated). 
Common longitudinal 
tilt (4zc—r stands for 
the elevation difference 
on the line C—E to be 
eliminated). 
Method 1 
  
+. 
2 
3. 
4. 
3. 
T. 
2. 
Q2 
1. 
2 
3, 
Plot point A or read coor- 
dinates. 
Proceed as under 1. for 
B. Determine As graphi- 
cally or numerically. 
Compute Abx according to 
As 
Abx = =. bxs and set 
it on the instrument. 
Clear vertical parallax with 
by at point 1 and bz at 
point 3. 
Repeat entire procedure. 
Set vertical control point A 
and determine z-coordinate. 
Set vertical control points 
B and C and determine 
Azw_ 4 graphically. 
Compute A& according to 
48 = dered 0 and intro- 
YB—YA 
duce it at the individual 
w-controls of the instru- 
ment. 
From the measurements at 
A, B and C determine 
Azc—r graphically. 
Calculate An according to 
Azc—n 
An Fra Q and re- 
adjust p4 and p by the 
same amount. 
Compute Abz according to 
Abz = 
es bx and intro- 
duce it. 
EE 
c 
Table 3 
Method 2 
Obtain coincidence between point A and 
map point A or read coordinates. 
. Set point B in the instrument. Determine 
Ay = (yB—yA)nom. (yB—YA)act. 
numerically or graphically. 
. Calculate the amount Ayp according to 
Ay» — — ——— + yp and introduce it in 
YB—YA 
the instrument in the direction of the 
nominal value. 
. Vary bx until the nominal value has been 
reached. 
. Clear vertical parallax with by at point 1 
and with bz at point 3. 
  
  
on 
. Compute Abz according to Abz = - a =» 
. Set vertical control point A and determine 
z-coordinate. 
. Set vertical control points C and B and 
determine Azp__ A graphically. 
. Compute dzy according to 
dzy = Azr—a|l + and set it on 
YB—YA 
the elevation counter in addition to the 
elevation of point A. 
. Using wa and wp introduce identical 
amounts at point B until this nominal 
elevation has been reached; in each case 
clear vertical parallax by readjusting «4. 
. Any residues encountered in the further 
operation should be empirically readjusted 
directly at B; c has little effect at A and 
great effect at B. If A and B lie on the 
KM line, wp will have a great effect on 
model tilt, while c4 will have practically 
none. 
. From the measurements at A, B and C 
determine Z1zc. graphically. 
: Azc—s 
. Calculate An according to An = 
XQ —XA 
an readjust p A and 9p by the same amount. 
An 
bx 
and introduce it. 
. After repeated heighting at points À and C 
use Abz for fine correction. Then obtain 
nominal value at C by means of bz. If A is 
not on the KM line, overcorrect nomi- 
ddz - xa : 
nal z at C by — and set at this 
XC—XA 
overcorrected value with bz (ddz = resi- 
dual error at C). 
. Then clear vertical parallax only with by.