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Other developments also influenced the design of the latest 
model Orthophotoscope. The success achieved in preparing orthophotographs 
makes it evident that the Orthophotoscope can be the core of a new map- 
ping system. For example, the Army Map Service proposal, presently under 
study, envisions the possibility of obtaining several useful map products 
from the single exercise of profiling a stereoscopic model, In addition 
to obtaining orthographically restituted imagery, the proposal includes 
the extraction of contour information, the recording and storage of the 
profile information, and the construction of master terrain models. The 
1960 Orthophotoscope has been designed to be compatible with these ob- 
jectives. 
FUNCTIONAL DESIGN OF 1960 ORTHOPHOTOSCOPE 
Unlike the earlier instruments which rested upon supports de- 
signed for other purposes, the 1960 Orthophotoscope (fig. 1) is function- 
ally designed from top to bottom. The supporting structure, an integral 
part of the new instrument, is sturdy enough to provide the desired 
stability. The ways along which the scanning apparatus travels have 
been machined precisely. These physical improvements will reduce, if not 
  
  
  
Figure 1. The 1960 Orthophotoscope with ER-55 projectors.