controls the intensity of the electron beam. The deflection of 
the beam is geometrically similar and synchronized with the two 
scanning tubes. The scale of the image is changed electronically 
as a function of the instantaneous height of the space rod inter 
section, as reguired by the geometric relationships for orthophoto 
graphy. Since the light spot of the scanning cathode ray tube is 
imaged at reduced scale on the dispositive and scanning is re 
stricted to relatively small zones, resolution of the television 
image on the orthophoto printing tube can be increased sufficiently 
to avoid any loss of details. 
The printing cathode ray tube is mounted face upwards on a carriage 
which rolls on a table mounted at the back of the B8. The carriage 
is driven by the same system of steel bands that drives the tracing 
stand. The table with the steel band system, the cross rails, and 
the triangular base-plate of this carriage, can be seen in Figure 6. 
Figure 6 
Cross Slide Flaunting for Crthophato Printing Tube