6. Working Group on Photographic Materials 
The Chairman of this Working Group is M. Jean Cruset. The Terms of 
Reference given were:- 
(a) evaluate present practice in photogrammetry in exposing, processipg, 
measuring photographic materials; 
(b) prepare a draft document on "Recommended Practices" in the choice 
of film, exposure, processing, storage, handling and measurement of 
photographic films - to be considered at the 1968 Congress; 
(c) draft a critical report on the properties and use of polyester and 
similar non-shrink film bases - as a guide to users; 
(d) institute programmes of experimental work on the photographic 
materials, where the evaluation in (a) above has shown the need; 
(e) co-operate with the Working Groups on Image Quality and Image 
Location, in work on o. t. f. methods and geometric accuracies of 
photographic materials; 
(f) consider the extension of work to other materials and photosensitive 
receivers, i. e. to infra-red, colour CRT screens, image intensifiera, 
etc. 
7. Working Group on Navigation 
The Chairman of this Working Group is Ir. F. L. Corten. The Terms of 
Reference given were:- 
(a) evaluate navigation facilities at present in use in photogrammetrie 
flying and to collect evidence from Companies and Government establish 
ments on their suitability, accuracy, operational limitations, etc.; 
(b) draft a report on the results of this evaluation making recommenda 
tions on equipment and methods of use; 
(c) consider the requirements for future navigation equipment for 
photogrammetrie purposes and draft a specification of these require 
ments for consideration at the 1968 Congress. This would form a 
guide to aircraft companies and to navigation equipment designers; 
(d) encourage experimental work on navigation - in collaboration with 
Commission II - where evaluation has shown the need. 
(e) obtain evidence from Operating Companies, etc., on environmental 
conditions in aircraft, i. e. temperature, vibration, height, forward 
speed, pressurisation, camera heating, etc. From these to formulate 
• li a set of Recommended Procedures. 
B.JL 
8. Progress of Working Groups 
In setting up the Terms of Reference of each Working Group, it was realised 
that it would be impossible to complete all the work before the 1968 Congress. 
Indeed, each Chaiiman was encouraged to select a small number of activities, for 
which he could achieve significant results, rather than disperse efforts. Many 
/of the