Bausch & Lomb Optical Co. 
635 St. Paul Street, Rochester 2, New York 
STAND 201 
Students Union 
Malet Street 
Representative: J. F. Starks First Floor 
Exhibit 
The exhibit will consist of a Balplex Plotter set up in a darkroom for 
demonstration purposes. The B. & L. instruments for Photo Interpretation 
which will be exhibited are the Tri Power Scanning Stereoviewer, a Hi 
Power Stereo-Zoom Microscope and a Zoom Magnifier. A measuring 
magnifier and standard Stereo-Zoom Microscope will also be displayed in 
addition to photographs of other photogrammetric instruments 
manufactured by Bausch & Lomb. 
Activities and Products 
The world’s most complete line of optical and ophthalmic instrumentation 
is manufactured by Bausch & Lomb. Scientific instruments include micro 
scopes, colorimeter-spectrophotometers, refractometers, spectrographs, 
and spectroscopes, photomicrographic cameras, projectors, saccharimeters, 
lenses, magnifiers, telescopes, and binoculars. Also, a complete line of 
precision photogrammetric instruments including plotters, auto-focus 
rectifiers, hi-tilt rectifiers, tracing tables, diapositive printers. In addition, 
special order items include aerial mapping and reconnaissance lenses, 
special rectifiers, printers, and stereoscopes. 
Bausch & Lomb is doing extensive development in the field of infrared 
optics. This year they have produced a stereomicroscope for photo 
interpreters equipped with zoom optics. 
Ilford Limited STAND 202 
Ilford, Essex Students Union 
Malet Street 
First Floor 
Exhibit 
The exhibit is mainly pictorial and is designed to illustrate the range of 
Ilford materials available for air photography and for use in map-making. 
Activities and Products 
Manufacturers of sensitised materials, chemicals, and accessories for all 
branches of photography. 
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C. F. Casella & Co. Ltd. 
Regent House, Fitzroy Square, London W.l 
Representatives: R. P. Abraham 
P. S. Twynam 
S. W. Richardson 
STAND 203 
Students Union 
Malet Street 
First Floor 
Exhibit 
A new instrument, based on a novel idea which has been patented is the 
Photogrammetric Analyser designed by R. C. Mcllleron of Southern 
Rhodesia. This instrument permits the tracing of contours without the aid 
of stereoscopic relief. This is achieved by using the “flicker” principle of 
presenting alternate views of a pair of photographs to the same eye. By 
adjusting the parallax the various planes can be made to appear stationary 
so that contours may be drawn. 
In addition there will be exhibited a Pocket Stereoscope, Folding Mirror 
Stereoscope, Stereometer and a Parallel Guidance Mechanism by means 
of which the last two may be moved over several pairs of 9 in.x9 in. 
photographs without the necessity of constant re-alignment. Lastly, there 
will be a radial line Slotting Machine for making templates for this 
plotting method. 
Gevaert Photo-Producten N.V. STAND 204 
Mortsel (Antwerp), Belgium Students Union 
Malet Street 
Representatives: Messrs. Gevaert Ltd. First Floor 
Exhibit 
Aerial photographs on Aviphot panchromatic films and plates and on 
Aviphot infrared film. Transparencies of aerial photographs. 
Activities and Products 
Photographic and cinematographic products for medical, scientific, 
graphic, and commercial purposes. 
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Stand 207 —coni. 
EXHIBITION GUIDE