No doubt the question was not clearly stated. It was intended to reveal areas 
of technical interest or problems in which the Commission could perform a useful 
service by stressing the need for research or by collecting and publishing test 
results. 
Switzerland has made the following proposals: 
1. To carry out the work suggested by Commissioni, second resolution, at the 
1960 London Congress.* In particular, the results of investigations into the dimen 
sional properties of Cronar and Estar film bases should be collected and published 
for practical guidance. 
2. To create an international standard form for Camera Calibration Certificates. 
No other Proposals entirely relevant to this section were received. 
Conclusions 
Overall, it is possible to record substantial progress in equipment for aerial 
photography and a deeper understanding of its technical problems. In particular, 
the need for improvement of lenses and shutters is less urgent now than it has 
been for sometime past. Nevertheless, the differences of opinion about the causes 
of image quality losses indicate the need for more objective evaluation techniques 
which can be applied throughout the photographic operation, in flight and at the 
printing stage, as well as in testing the lens and negative emulsion. As suggested 
in this report, the sophistication of such techniques tends to exclude them from 
general use; possibly a central testing service could be organized. 
There has been no indication of any one area of aerial photography lagging so far 
behind as to require special research, and it appears that technical progress will 
continue according to the normal economic incentives. This observation is subject 
to the qualification that the paucity of replies on Stereoscopy and Navigation make 
it difficult to form a balanced judgement on these subjects. 
It must be admitted that the questionnaire technique was not notably successful in 
eliciting information about the current state of the art. Many activities which are 
known of were not reported on; indeed some countries made no replies of any kind. 
(Similar difficulties have been experienced within national societies) . For example, 
it is known that in the Netherlands and U.S.A (and possibly elsewhere) valuable 
studies have been made of the performance of viewing and plotting apparatus, using 
transfer function techniques, but no information was supplied about this work. Other 
examples could be quoted. If the Commission Reports are to be fully representative 
of technical progress, it appears to be necessary to devise new methods for obtaining 
up-to-date information. 
* 1960 Archives, Vol. XIII, Part I, pages 61 and 62.