HORIZONTALLY ORIENTED 
POLAROID 
    
CATHODE-RAY 
TUBE 
CATHODE-RAY 
TUBE 
VERTICALLY ORIENTED 
POLAROID 
MIRROR 
HALF-SILVERED 
MIRROR 
  
  
FIGURE 5-UNAMACE Stereo Viewer 
An electronic stereo viewer (center) 
provides the operator with a “window” to 
the operation, thereby permitting him to 
monitor the area under consideration and 
to take appropriate action when needed. 
Pushbuttons on the switching panel per- 
mit changes in the effective magnification 
(X2 and X4), interchange of the left- 
right images (to produce a pseudo-stereo 
view), and interchange of the x-y axes (to 
permit y-directed parallax to be observed 
as height displacements). An electron- 
ically developed crosshair in each view is 
used as a reference for x-y centering in 
monoscopic operations or as a height ref- 
erence for stereoscopic measurements. 
A reference viewer, located at the right 
of the console, embodies a light whose 
position on the viewer indicates the obser- 
vation position of the selected table. Dur- 
ing measurements, the viewer contains a 
print corresponding to the diapositive on 
one of the tables, and the light indicates 
the position of the field of view. Conse- 
quently, the reference viewer serves to 
supplement the stereo viewer whose small 
field of view inadequate for some 
operations. 
is 
On the desk under the reference viewer 
is a manual positioning control which, to 
the operator, appears as a small “bowling 
ball” whose top protrudes through the desk 
top. Motion of the ball is communicated 
to the computer through appropriate codes. 
During comparator-type measurements, 
backward or forward motions of the top 
of the ball are used to effect y-position 
changes for a designated table, while cross- 
wise motions of the top of the ball are 
used to transmit x-position changes for the 
designated table. When operating in a man- 
ual stereo mode, backward or forward 
motions of the ball may be used to effect 
altitude corrections. 
On the left of the desk is a keyboard 
for communicating with the computer. This 
is used by the operator to select the oper- 
ating mode (e.g., comparator or compila- 
tion operation), provide for expansion of 
the field of view in the stereo viewer, or 
change the sensitivity of the position con- 
trol (through successive multiplications 
or divisions by four). Additional keyboard 
operations are described subsequently in 
terms of related operational modes. 
The stereo viewer (Figure 5) is basically 
a twin television set, incorporating two 
vertically disposed 4-inch tubes, whose im- 
ages are superposed using a half-silvered 
Crossed polaroid filters in the 
two optical paths and correspondingly 
crossed filters in glasses worn by the 
operator separate the pictures for pre- 
sentation to the appropriate eyes of the 
operator. 
mirror.