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11. PSC Applied Research Limited. 
1500 O'Connor Drive, Toronto 16, Canada 
Representatives 
D. J. Dalzell 
D. S. Ross 
G. Schmidt 
Exhibit 
Type T 301 Gamble Stereo Plotter 
Type T 246 Mk 3 Automatic Tri-Film Processor 
Type T 232 Mk 7 Instrumentation Camera 
Activities and Products 
Before each product was produced by PSC Applied 
Research Limited there was a specific problem. Solving 
these problems, using electronic or mechanical means 
or a combination of both, has resulted in an impressive 
list of instruments and equipment successfully engi 
neered and carried into final production. This list in 
cludes aerial survey equipment such as cameras, ra 
dioactivity detectors, electromagnetometer detectors, 
airborne profile recorders, microwave path test equip 
ment, radar equipment and aerial navigation equip 
ment. Much has been done on processing and data 
reduction equipment for the air survey industry and 
defense requirements. An automatic film processor 
and printer has filled a long-waited need. Automatic 
control equipment for aircraft—ice-shedding control 
systems, rocket-firing intervalometers, armament con 
trols, gyro-stabilized platforms—have brought pres 
tige and recognition. Miscellaneous items include 35 
mm. recording cameras with electrical programming 
control, camera intervalometers, positional and rate 
servo mechanisms, analog computers, specialized opti 
cal applications, the fabrication of microwave plumb 
ing and the production of test equipment for all major 
products. 
12. Svenska Sallskapet for Fotogrammetri. 
(The Swedish Society for Photogrammetry) 
Fôrsvarsstaben, Stockholm 90, Sweden 
13. Williamson Manufacturing Co., Ltd. 
22 Litchfield Gardens, Willesden Green, 
London N.W. 10, England 
Representatives 
J. E. Odle 
J. G. Hunter 
Exhibit 
Williamson large scale plotter, Type L.S.P. 
This is a new projection plotting instrument which 
fills the gap between expensive first-order machines 
and equipment designed primarily for small and me 
dium scale work. 
Williamson Ross Multiplex mapping equipment. Type 
This light, simple 3-projector frame assembly is a good 
instrument for taking off topography. 
Williamson Eagle 9 Mk.2 air survey camera 
The standard survey camera. 
Williamson Eagle 10 air survey camera 
The Jackson Stereoscopic Projector 
Makes the 3rd dimension available in illustrated 
lectures. 
Activities and Products 
Williamsons offer a complete range of precision air 
survey instruments. All units, from the air camera to 
the Multiplex projectors, are carefully matched by 
individual calibration. Backed by forty years’ experi 
ence, Williamsons have always been early in the field 
with new developments. Williamson air survey cam 
eras and mapping equipment incorporate the latest 
scientific and technical aids. 
The parent firm in England and its subsidiary in 
Canada are represented throughout the world. 
Swedish Representative 
Aero Material AB, Lastmakaregatan 24, Stockholm C 
14. Mapping and Charting Research Labo 
ratory. 
Institute of Geodesy, Photogrammetry, 
and Cartography 
The Ohio State University, Columbus 10, Ohio, USA 
Representative 
Professor F. J. Doyle 
Exhibit 
The exhibit comprises three sections of experimental 
charts. Section I shows patterns of relief obtained in 
diversified terrain by dividing ground SLOPES into 
four discrete ZONES and showing them in four grey 
tones. The potential of the system as a relief base 
for aeronautical charts is demonstrated. Section II 
represents a sheet of four varieties of an experimental 
aeronautical strip chart in which hypsometric tints 
are used in a new way. They show relative elevations 
related to a VALLEY SURFACE instead of to sea 
level. Explanatory profiles are included. Section III 
shows combinations of slope zones with other topo 
graphical information. 
Activities and Products 
The Mapping and Charting Research Laboratory per 
forms contract research in the geodetic sciences for 
various governmental and private agencies. The Insti 
tute of Geodesy, Photogrammetry, and Cartography 
offers course work leading to undergraduate and grad 
uate degrees in geodetic science. Both organizations 
are within the Ohio State University at Columbus, 
Ohio.