452
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453
Image rotation is performed with the knurled knobs on ihe
photo carriers, The convenient setting and the high reading
accuracy of 0,02 gon or 0,02 mm resp., are of particular
advantage in numeric orientation methods with transfer of
the calculated orientation data from gerial triangulation
or in computer-aided plotting.
With the viewing system the photographs are observed frontally
from below with a constant 7-fold magnitication. Longitudinal
and lateral tilt as well as the bx-setting require optical units
which compensate displacement, The measuring beam has been
kept very short, for it is already in the camera where photo-
graph and fiducial mark are united, so that no measuring
errors are produced by the optical system. The fiducial mark
is a green luminous mark with a size of 0,04 mm, Image illu-
mination and fiducial marks are separately adjustable in
brightness. The Schmidt prisms installed on either side of
path of rays permit the compensation of an image rotation,
any. The large visual field of 32 mm in connection with the
natural stereoscopic viewing of the terrain in frontal image
observation has a favourable effect on the sure guiding of the
measuring mark in the plotting of contour lines, The high re-
solution capability of the coated optics guarantee the recog-
nition of smallest details in the photograph.
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In the STEREOPLOT the ratios of image scale to model scale are
as follows:
90. min, 1,44 . max. az
450 nine “1.25 "max. 232
Cy. = SAS sills «d MEX, 1.9
With the transmission possibilities on tne plotting tables,
viz. eléctrical plotting tables 0.16 tg 6,25 and digitel
plotting tables 0.01 to 9.99, we are capable of achieving
transmission ratios of 1:12 for electrical plotting tables
and 1:20 for digital plotting tables between image and map
scales, The electrical plotting tables 120 x 120 EZ-A and 90 x 124
EZ7-F are electrically coupled with the plotter vi& synchros.
The electric connection allows the place of ereotion.to be
freely chosen, The plotting tables are provided with trans-
mitted illumination. The plotting ranges are 120 om x 129 cm
or.90.em x.1206.cm, resp. A variable gear enables plottings to
be made at 21 different scales between 0,16: $0:6,25-fold, The
stylus carriage is fitted with a lifting magnet which is actuated
by a foot switch. The mount of the lifting magnet takes holders
for leads, steel scribers, sapphires, ball-point refills and
ink-pens, A warning system signals the limits of the ranges.
The plotting table can be correlated to the plotter by cable
exchange and the sense of rotation freely selected.
The DZT 90 x 120 Digital Plotting Table or the computer-aided
plotting system are linked vi& connectors to the three encoders
in the STEREOPLOT, The drive of the two plotting table coordi-
nates is effected by racks and pinion which are connected
