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At 3.35 p.m. the floor was given to Mr. Perc 
"Stereo-Maps". Following this paper Dr. Burckhardt 
tion and indicated that trials have been made in Germany of such stereoscopic 
photo maps. The impossibility of obtaining good results: in countries of high 
relief, such as the Alps, has been encountered due to the difference in scale. 
There were the skrinkages in the depths and the exaggeration of the high areas. 
The last trials made with most modern objectives have shown that it is more 
useful to fly high enough for all the corresponding surfaces of one portion of 
the map to be covered by a single photograph and with a very large overlap so 
that one may choose among the photographs those that give at the same time 
good stereoscopic relief and a correct perspective impression. 
Mr. Percy Tham replied that he had never heard of these trials but the 
method being used in Sweden was independent of the relief of the ground. 
To a question from Mr. Poivilliers about the method of making these 
photo maps, Mr. Percy Tham regretted that he could not furnish any infor- 
mation regarding the method. Mr. Poivilliers then explained his regrets that 
communications of this kind had been presented without any indication of the 
procedures employed and that the authors refused to give any explanation on 
the grounds of secrecy. 
At 3.48 p.m. Mr. M. Eden 
grammety 1n Great Britain. 
At 3.55 Mr. Scherpbier (Netherlands) 
"Application of Photogrammetry to Road L 
At 4.02 Mr. von Frijtag Drabbe presented 
vision". 
At 4.14 Mr. Nistri (Italy) 
graphic Reproduction As an I 
graph and Plotting”. 
At 4.27 Mr. Daniel (France) summarized in the name of the Institut Geo- 
graphique National the paper on the map of the Grand Duchy of Luxembourg, 
then the paper entitled "Photogrammery at the Institut Geographique Natio- 
nal". No discussion followed the presentation of these several papers and the 
meeting adjourned at 4.50. 
y Tham for a paper on 
requested some explana- 
(England) presented some aspects of photo- 
summarized his communication 
ocation in Tropical Areas". 
"Some new aspects of stereoscopic 
gave in place of Mr. Parenti the paper ,,Photo- 
ntermediate Step Between Taking the Photo- 
Meeting of 12 September 1952. 
This meeting was devoted, as we have said, to worl 
ung up of resolutions 
of Commission II to be presented at the plenary session of the International 
Society. The meeting commenced at 1.28. The President read the proposition 
drawn up by the French delegation for the organization of international com- 
petition. Mr. Harry requested the floor at 1.35. He declared himself in agree- 
ment with the principals of research on standards but did not let the French 
proposition go too far? Could not one be satisfied with classification of plot- 
ting machines as large scale, small scale, and air triangulation? Mr. Poivilliers 
responded pointing out the difficulty of establishing the classification. Bv 
whom would the supervision of tilt be granted? Besides the classification will 
apply only to the precision and not to the production or the kind of work. Mr. 
Poivilliers explained. several foreseeable difficulties in carrying out the French 
proposition, taking the photographs, assemblying the plotting machines, selec- 
tion of the place for the trials and organization of the inspection, but all of 
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