16 
Switzerland: 
Professor Dr. M. Zeller has made experiments on the use of photogram- 
metric methods to determine movements, related in his publication »Ste- 
reophotogrammetrie und Bewegungsstudien», Industrielle Organisation 
1950/4, E.T.H. Zürich. 
Question No. 8: 
What is your opinion on the importance of X-ray photogrammetry? 
Austria: 
X-ray photogrammetry is certainly of great importance. To make an 
extensive use of this important branch of phetogrammetry possible at the 
X-ray institutions, comparatively simple methods and instruments are re- 
quired. Nearly the same remarks can be made for the use of micro photo- 
grammetry (light and electron microscope) for the purpose of surface 
and material tests and structure research. By experience it is always diffi- 
cult to force thrcugh a measuring method in scientific research of whatever 
domain, when special knowledge is required for its use. 
Belgium: 
Belgium has got no information concerning X-ray photogrammetry. 
France: 
Perfection of surgical methods, allowing direct visibility of all bone 
and intestinal regions, has resulted in more and more limited use of 
X-ray photogrammetry to find out positions and directions. Anatomic 
knowledge of morphology and topography has appeared to be the most 
suitable guide for medical purposes. 
The anatomic treatment of injuries and foreign bodies is best made by 
common stereoscopic viewing of two pictures. This accounts for the lack 
of progress in the attempts to improve the instruments for locating foreign 
bodies. 
Only the pelvimetric X-ray or the measuring of the feminine basin, is 
still of a notable obstetrical interest. 
X-ray tomographic methods are still in current use in spite of the cri- 
ticism to which they have been exposed. Linear trajectory instruments 
(Tomography) are common, thanks to their easy handling. Spiral or 
epicycloidal trajectory instruments have been taken up again by various 
French constructors. One of these currently constructs an instrument with 
horizontal cut, based on a principle, presented by Lacroix at the same time 
as by Vallebona in 1947. 
Israel: 
The Israel reporter states: »In our opinion X-ray photogrammetry is a 
very important branch, but as the medical (or other) research people are 
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