49 
50 
51 
52 
Stand 220 —cont. 
Aerial camera and projector adapted to the microscope, to make 
easier the junction between triangulation strips. The images of these 
junction points are projected into one of the eyepieces, to make them 
identified, and have their homologous images sighted without error in the 
new strip. 
Automatic equipment for measuring and registering coordinates on a 
printing or tape-punching machine; this system incorporates Ferranti 
gratings measuring directly the motions of the carriages, without any 
connexion with the controlling pieces, therefore operating with permanent 
accuracy, being independent of mechanical wear. 
Panel showing at any moment the position of the carriages, and giving 
the coordinate with an accuracy of two microns. 
Stereotopograph Type DA with Electric Coordinatograph and Automatic 
Registering System. The well-known SOM D4 is shown in London with 
new equipment consisting of: 
Automatic registering and printing system of the coordinates. 
A new electrically controlled Coordinatograph. This equipment makes it 
possible to do a very large drawingi 1000 mm. x 1000 mm.) on a ground 
glass of same size, illuminated from underneath. Readings on verniers 
to 1 /20th of millimetre. 
Sterephot. This second order plotting instrument was exhibited as a 
prototype in Stockholm, in 1956. 
It is now manufactured in an ultimate design. Its optical-and-mechani- 
cal principle for reconstitution of the perspective rays results in a really 
simple construction. 
The Sterephot is particularly efficient, owing to the possibility it gives of 
setting the photographs in place and carrying out plotting and drawing 
very quickly. 
It is perfectly adapted to regular plotting at medium and small scales, and 
map revision at every scale. 
Stereoflex. A new third order plotter which already meets with great 
success in many countries in the world. 
This success comes from the utmost simplicity and low price of the 
Stereoflex, as well as its special feature of giving a plastic image of the 
whole pair of photographs. 
It constitutes the most highly perfected equipment for quick altimetric 
and planimetric plotting at medium and small scales, and geological 
mapping. Particularly suitable, too, for training and teaching purposes. 
Stand 220 —cont. 
Mirror-stereoscope. The type C.3 is an improved SOM model designed 
for examination of photographs up to 9 in.x9 in. without any super 
position. 
Magnification 3-2 x is given by removable binoculars; its main feature: 
a rigid frame with removable legs ensuring a permanent adjustment. 
Activities and Products 
Other products of the firm: 
All photogrammetric equipment (taking and plotting) particularly first 
and second order plotting machines. 
Optical instruments for military purposes. 
Optical instruments for Industrial and Nuclear purposes. 
Som-Berthiot lenses with fixed and variable focal length (Pan-cinor). 
Som-crh Hydraulic drives. 
Meridian Airmaps Limited 
Shoreham Airport, Shoreham-by-Sea, Sussex 
Representatives: N. E. Lamb 
A. P. Gillings 
R. H. Windsor 
H. G. Gibson 
H. H. Price 
STAND 301 
Deller Hall 
Senate House 
Exhibit 
Southampton Docks—“The Gateway to the Empire”. A precise photo 
grammetric survey undertaken for the British Transport Commission. 
The survey on view forms part of the original project which covered the 
whole of the old and new docks, at a scale of 1/480 or 40 ft. to 1 in. To 
further illustrate the complexity of detail on this type of survey and also 
to present an ancillary service we are showing a terrain model of the old 
docks, to a scale of 1 : 1250 or 104-166 ft. to 1 in. 
Activities and Products 
The combined organisations of Meridian Airmaps Limited and Associates, 
Le Grand Adsco Ltd. and Site Investigations Ltd., provide a consultancy 
and technical service in all parts of the world, specialising in air photo 
graphy, photogrammetry, hydrology, geology, geophysics, soil mechanics 
and drilling operations. 
EXHIBITION GUIDE