C - REPORT ON THE SCIENTIFICAL ACTIVITY AND EXPERIMENTAL RESEARCH 
WORK ORGANIZED BY COMMISSION III 
1. — BRUSSELS PREPARATORY MEETING AND LONDON CONGRESS MEETINGS’ ORGANI- 
ZATION 
At the Stockholm meeting of July 26th, 1956 Commission III passed some risolu- 
tions intended to inspire the activity of the Commission itself during the four years 
1956-1960. 
In the first of these resolutions Commission III recommended that at least one 
meeting of aerial triangulation experts should be organized before the coming Congress 
and gave the Commission's President a mandate to collect proposals and suggestions 
sent to him to that effect, and to fix a date, choose a place and prepare the Agenda for 
a Conference of all aerial triangulation experts. 
Taking advantage of the Belgian Photogrammetric Society’s kind invitation, this 
Presidency Office in compliance with the resolutions adopted at Stockholm, invited 
a large group of aerial triangulation experts at a meeting to be held in Brussels in May 
1958. 
In March 24th, 1958 the Commission's President by Circular N° 1 fixed the pro- 
gram of the Brussels Meetings. This program was essentially based on the following 
3 points: 
a) Presentation on the part of 2 Rapporteurs of their own respective reports, 
on two problems of particular interest to Commission III, and consequent discussion 
of such reports. 
b) Discussion about the new rules for taking part in the new « Essais Contrólés » 
cycle organized by Commission III 
c) Preparation of the London Congress. 
The subjects chosen for the scientifical discussion were: « The problem of blocks 
of strips » intrusted to Ing. M. Bonneval and « The analytical triangulation » intru- 
sted to Prof. E. H. Thompson. 
A short report has been issued, concerning the aforesaid meeting, on the « Bulle- 
tin de la Societé Belge de Photogrammetrie » N° 52 — June 1958, followed by Ing. 
Bonneval’s report. From the report of both meetings, it can be deduced the high level 
of discussions happened among the participants, the addresses which have suggested 
during the aforesaid discussion to the Commission III's Presidency on the matter of 
the scientifical organization of the London Congress and the preparation of a new 
series of experimental tests to be organized by the Commission itself. 
About the decisions taken in relation to experimental tests, they will be explained 
in the following paragraph, while we shall mention here the decisions taken for the 
Congress preparation. 
On the basis of what appears from the Brussels discussion and the favourable 
opinion expressed by National Rapporteurs and the Commission’s experts questioned 
through a special circular, the Presidency Bureau chose the four following subjects 
for the Congress discussion appointing one or two Rapporteurs for each subject, en- 
trusting them with the drawing-up of a Report to be printed and distributed before 
the beginning of Congress. 
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