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10
be used interchangeably to carry diapositives or
film sheets. The control console includes a stereo
viewer for monitoring the automatic compilation
operation; it is arranged to permit stereo obser
vation of images from any two of the four tables,
thus providing a capability for making virtually
simultaneous stereo comparator measurements on
up to four diapositives. To assist in the com
parator operation, the images can be rotated 90
degrees to facilitate observation of Y parallax,
and the left and right images interchanged to
obtain a pseudostereo view. A reference viewer
on the console is intended to carry a print corre
sponding to a diapositive used in one of the tables.
The viewer has a carriage which may be slaved to
any one of the four tables in accordance with the
position of a selector switch. A light moved by the
carriage illuminates a small area on the photo
print to indicate the area under observation at the
corresponding table. A position control, located
under the reference viewer, permits the operator
to change (through the computer) the x- and/or
y-position of any of the tables or the height during
compilation. A set of pushbuttons on the console
permits the operator to select the desired opera
tional mode.
A Bunker-Ramo Model 133 Digital Computer,
shown to the right of the console in Figure 10,
calculates the table coordinates and scan coeffi
cients and controls the operations. A typewriter at
the left of the console is used for computer check
out and off-line program and data preparation. A
two-bay electronic rack carries the timing signal
generators, scan generators, correlators, and com
puter interface equipment. Table servo- and scan-
drive amplifiers are located in small racks
adjacent to the associated tables.
SCANNING TABLES
The configuration of a scanning table is shown
in Figure 11. The UAMCE requires four of these
tables.
The requirements for the table are quite
unusual. It must be capable of moving a 9- by
18-inch glass plate at peak speeds of over two
inches per second on orthogonal axes (with an
average speed of one inch per second during com
pilation) and of positioning the scanning to
within a 4-micron rms error on the plate. The
required two-coordinate motion is provided by
dual carriages, with one carriage riding on top
of the other.