18 
2( 
3« N. V. Optische Industrie »De Oude Delft». 
Oude Delft 36, Delft, Holland 
Exhibit Th 
Negatives, prints, plates; aerial photographs; photo- 1 
graphic material used by other French exhibitors. 
Representative 
W. Vos 
1 
Activities and Products 
Guilleminot, Boespflug & C°, founded in 1858, manu- 
Exhibit 
factures photographic plates, papers, and films, and 
The Old Delft ODSS II scanning stereoscope, a mirror 
stereoscope for better interpretation of stereoscopic 
pictures. 
pays especial attention to the scientific applications 
of photography. In cartography, the firm has contrib 
uted to the creation in 1930, of the »Société Finan- ^ 
cière d’Exploitations Industrielles», which after having 37 
Activities and Products 
been transferred to the Government and given the 
name of »Le Service des Réévaluations Foncières» is 
Active in the medical (X-ray), photogrammetric and 
cinematographic fields. Manufacturers of the Odelca 
X-Ray camera with mirror optics, the ODSS II scann 
ing stereoscope, Delrama anamorphic systems for 
professional and amateur use, and cameras for aerial 
photography, as well as telescopic lenses of extremely 
long focal lengths with mirror optics. 
responsible for cadastral surveying. Before this and Es 
in collaboration with the »Service Géographique de 
l’Armée (now, the »Institut Géographique National 
Français — I. G. N.) Guilleminot, Boespflug & C° e 
developed the emulsions still in use for aerial photo 
graphy at this organization. The firm is also an im- ^ 
portant furnisher of sensitized materials to private 
companies specializing in aerial photography and Ec 
Swedish Representative 
Broderna Âstrôm AB, Malmtorgsgatan 8, Stockholm 
photogrammetry. cir 
re( 
Fo 
Institut Français du Pétrole ch 
4. French Participation. 
R. Guilleminot, Boespflug & C° 
22 rue de Châteaudun, Paris (IX 0 ), France 
Manufacturer of photosensitive plates, films, and pa 
pers. 
4 place Bir Hacheim, Rueil-Malmaison (S&O), France 
Li 
Representatives ^ 
Prof. J. Flandrin 
R. Brasseur 
17 
Exhibit 
the results of the photogeologic interpretation on a 
The exhibit consists entirely of photogeologic maps 
and the photomosaics on which they are based. These 
materials were chosen to illustrate the application of 
photogeology in France, North Africa, the Sahara, 
Guinea, and other regions. 
The examples chosen are of interest in sedimentary 
geology as well as petrology. They emphasize the 
interest of aerial photos in oil and mineral prospecting. 
These maps have scales from 1:200,000 to 1:20,000 for 
use in general reconnaissance, systematic reconnais 
sance and detailed works, respectively. 
topographic base with the aid of a plotting instru- Pc 
ment. an 
3. Cartography: final editing of maps and prints. ^ c 
PI 
Principal applications: oil and mineral prospecting. ç € 
Institut géographique national 
136 bis, Rue de Grenelle, Paris (7°), France 
T1 
Exhibit Pi- 
Display matter grouped on three panels. Subjects: 
a) Photographic squadrons of the National Geo 
graphic Institute. ^ 
Activities and Products 
b) Base maps produced by photogrammetric methods In 
The goal — the establishment of photogeologic maps 
giving the maximum information about the geologic 
structure of a region before beginning the field work. 
These maps are intended to facilitate prospecting; they 
should give the geologist all information needed for 
organizing his field work: structures, faults, folds, 
lithological facies, and the like. 
and published by the National Geographic Institute. M 
c) Special projects based on photogrammetry, large- SC 
scale maps, city maps, cadastral surveys, architectural g r 
surveys, and the like. S( 
The display matter consists of photographs, stereo 
records, published material, diagrams etc. St 
57 
Activities and Products 
Method of presentation: 
1. Photo interpretation: systematic stereoscopic stud 
ies of every photograph through; superficial examina 
tion and precise plotting of observed geologic facts. 
2. Photogrammetry: to obtain maps on a given scale, 
simple photogrammetric methods are required such 
as templets, rectification (the rectification method of 
the French cadastral survey is used), superposition of 
The National Geographic Institute is making three R< 
photogrammetric base maps: ^ 
France, scale 1:20,000 p 
North Africa, scale 1:50,000 p 
Territories of the French Union, scale 1:50,000 and j 
1:100,000. 
For the photogrammetric work, the Geographic Insti- 
tute uses about one hundred Poivilliers—SOM plotting 
machines of Types B, C, and D.