by the camera axes, or - stereoscopically - at points of equal depth in 
the optical model lying on the two facades and on the horizon. 
d. Make relative and absolute orientation of the elements of inclination 
w' and w'' with change in depth along the line of the horizon upon the 
building. Corrections of relative orientation in w'' are characterized 
by overcorrection of y parallax or exaggeration of it at near and far 
points. Check absolute orientation of w' and w'' on vertical lines of the 
building. 
e. Make relative orientation of bz'' by elimination of y parallax along a 
vertical line near the camera axes. 
f. Make relative orientation of the elements of convergence d&' and &'' 
by elimination of y parallax along a vertical line as far as possible 
to one side of the camera axes. 
g. With the terrestrial gear system of the A 7 Autograph plot in plan 
drawing the corner of the building and horizontal dimensions measured 
from it. Analyze any bow inwards or outwards of the facades and any 
distortion of the right angle of the corner into small corrections of 
relative orientations of $'' and bz''. The orientation can be checked 
further for scale differences in two vertical dimensions which differ 
greatly in their depth in the optical model. 
h. Scale the optical model with proportional changes of bx, by'' and bz''.