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varied from 1.5x to 5.0x. ^A continuously changeable speed 
of scanning and the corresponding automatic control of film 
exposure is being attempted. 
  
Fig. ‘19° Orthocattograph 
Á separate channel will permit the hook-up of an 
automatic image correlation device. An on-line and an 
off-line mode of operation are foreseen. To control the 
operation an incremental digital servo system has been 
introduced throughout the instrument. 
b. Stereocompiler 
This is a very simple stereo-plotter for proces- 
sing of stereo-orthophotos. Two models have been built: 
one, smaller, for graphical plotting and measurements of 
elevations, and the second, much larger model equipped 
also: with. X and. Y coordinates measuring facilities. Air 
cushions provide smooth, frictionless, simultaneous move- 
ment of both images. : The plot ds scribed directly on a 
scribe coat, and the result is visible in the viewing sys- 
tem which is a very important and novel feature. Another 
new and very interesting possibility is plotting (scribing) 
in the stereo-mode. This is necessary for true, three- 
dimensional mapping, a new concept of map.