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(1) Image and linear measurements on film or glass plates are pos
sible through the use of optical encoders with X and Y precision ground ball lead
screws.
(2) A relatively high accuracy system is also available which uses
optical electronic reading heads in conjunction with calibrated glass scales for
measurements in each axis.
(3) Also available are capabilities for very high accuracies and re
peatability. In this latter case precise measurements in the X and Y axes of both
left and right formats are possible. Use of a Universal Automatic Laser Inter
ferometer (Model 437L-512) affords "built-in” calibration capability which allows
calibration to be carried out by the viewer operator. High accuracies are made
possible because the system measures functions of wavelengths of light practi
cally independently of the small inaccuracies found in the Vee Grooves and Flat
Ways. This capability allows the operator to check and calibrate his own in
strument during convenient time periods with minimum interference to production.
The high accuracy measurement mode has a dual format - dual axis laser measuring
capability. It may be used as a stereocomparator with readouts from each of the
two objective heads; or, it may be used to measure randomly oriented vector
distances relative to any operator-selected reference point within the scope of
either objective head.
WILD-RAYTHEON.
The combined companies of Wild, Heerbrugg, Switzerland, and Raytheon,
Alexandria, Virginia, USA, have produced the B8-Stereomat. Since the convening
of the Lisbon Congress of ISP in 1964, when the first prototype was displayed, a
number of vital changes and/or additions have been made. In its present configu
ration it can be used as a manual optical-mechanical plotter; as an automatic
orthoprinter; as an automatic contour compiler; and, as an automatic stereo-
model digitizer. Further, it can perform automatic relative orientation; it can
record stereomodel coordinates automatically in a wide variety of modes (such as
hard copy printout, on punched cards, on punched paper tape, or on magnetic tape);
it can utilize wide-angle photography or super side-angle photography; it has a
viewing magnification capability of 7. 7X; and it provides a picture scale, referred
to maximum model area, of 1. 4X to 2. IX for the wide-angle and 1.7X to 2. 3X for
the super wide-angle photography. Terrain data may be compiled automatically
in a continuous contour line mode or in a profiling mode (same mode as is used
for orthophoto printing) in adjacent strips; average velocity of profiling can be
preselected from various values. The size of the flying spot as projected on the
diapositive determines the resolution of the orthophotography (the equivalent value
projected on a diapositive is decreased proportionately in accordance with the
ratio of enlargement of the orthophotograph over the diapositive).
D. BROWN ASSOCIATES, INC.
The D. Brown Associates, Inc., Melbourne, Florida, USA,, has developed the
Self-Calibrating Multi-Laterative Plate Comparator, a light-weight, simple, re
latively inexpensive, and precise measuring device. Its characteristics are
