1. — The first proposal, right in its formulation, did not have any confirmation 
in practice, perhaps because of the scanty information gathered on this subject. 
2. — Unfortunately, the second proposal can be wholly repeated: « The compa- 
rison of triangulation methods has not yet an objective basis ». This is true, despite of 
the several reseach works carried out to this purpose, and, mostly, despite of the great 
research effort made by the Commissions A and B of the O.E.E.P.E. 
3. — The perfect truth of proposal N° 3, manifest since the very beginning, 
has been fully confirmed by the fact that 3 types of Stereocomparators, based on 
technics and precisions substantially new, have been forecast, built and tested during 
the latest four years. These apparatuses have not only allowed the development of 
researches in the field of analytical aerial triangulation, but, in a sense, have consti- 
tuted the greatest spur for affirmation of the new proceeding. 
4. — Also the 4th point among the Van der Weele's conclusions has been fully 
confirmed in practice. 
The problem of blocks, both from the point of view of their execution and adjust- 
ment, has constituted one of the greatest scientifical and technical efforts during the 
latest four years. 
Even if the problem is still looking for a definitive solution, yet it has already 
been possible to attain remarkable advanced positions either as formulation and so- 
lution. 
5. — Proposal N° 5 concerning the great importance of auxiliary equipments 
for the determination of the axis’ inclination of the camera to be used for the block 
adjustment, is still fully valid. 
During the past four years, it was the kernel of several scientifical researches: 
unfortunately is has been scarcely faced in practice and consequently it has not vet 
reached a definitive form. 
6. — The method of blocks” adjustment with least square method is analogously 
at the study phase, yet it can be a determinative solution of all questions concerning 
the problem, as already perceived by Mr. Van der Weele. 
7. — As foreseen in the 7th conclusion, the working practice has laid a special 
attention to the methods of electronic localization of the aircraft in flight. 
The attention has been unilateral. Namely, it aimed towards those localization’s 
methods requiring apparatuses on board of the plane and not expensive installa- 
tions on the ground. 
Development has been mainly allowed by the use of the A.P.R. determining elec- 
tronically the altimetric outline of ground on the strips’ axis. 
8. — On the contrary, numerical radial triangulation for which in statement 
N° 8 it was foreseen a more wide acknowledgement, is still little used. 
The aforesaid acknowledgement shall not fail to show itself as soon as its real 
usefulness, which at the present is often bidden by an excessive amount of computations 
not always advantageous, is acknowledge. 
To conclusions of the previous Report, mostly valid and significant, we let our 
conclusions follow, basing them on the new researches made. 
They can be synthetised into the following points that we wish may obtain from 
practice, the same approbation of those stated four years ago. 
22 
   
  
  
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