Part 4 a 
Commission I 
IA 1 — 277 
I B 1 — 272 
IB 2 —162 
IB3 —111 
I B 4 — 266 
IB 5 —107 
I C 1 — 167 
I C 1 — 112 
ICB2 —116 
IE 1 — 121 
I F 1 — 120 
I H 1 — 117 
I H 2 —118 
I M 1 — 269 
10 1 — 122 
I P 1 — 279 
I P 2 — 169 
IP 3 — 270 
IS 1 — 108 
IT 1 — 119 
I W 1 — 267 
L. Âhstrand, Sweden: Aerial photography with small aircraft under tropical 
conditions. 
P.-L. Baetslé, Belgium: L’exagération apparente du relief dans l’observa 
tion des stéréogrammes. 
G. C. Brock, Great Britain: Advances in sensitive materials and techniques 
for air photography. 
W. A. Brucklacher, Germany: Gesichtspunkte zur Verwendung der Kon 
vergentkammer 2XRMK 21/18 von Zeiss-Aerotopograph. 
FI. Bäckström, Sweden: Some investigations about film and filter questions 
in aerial photography 
L. Bertele, Switzerland: New photogrammetric lenses. 
Institut Géographique National (J. Cruset), France: Les laboratoires du 
service des études et fabrications de l’Institut Géographique National. 
Institut Géographique National (J. Cruset), France: Méthode générale 
d’étalonnage des obturateurs photographiques. 
P. D. Carman & H. Brown, Canada: Differences between visual and photo 
graphic calibrations of air survey cameras. 
L. Ekelund, Sweden: Some investigations into distortion of air cameras. 
R. W. Fish, Great Britain: Notes on calibration of cameras for air survey. 
B. Hallert, Sweden: A new method for the determination of the distortion 
and the inner orientation of cameras and projectors. 
B. Hallert, Sweden: The grid method and the y-parallax method for the 
determination of systematic disturbances in aerial and terrestrial photo 
graphs. 
H. K. Meier, Germany: Ein neues Statoskop mit elektrischer Registrie 
rung. 
L. Ottoson, Sweden: Comparative tests of the accuracy of panchromatic, 
infra-red and colour pictures from the air for photogrammetric purposes. 
C. Powell, Great Britain: A radio aid to air survey. 
G. Parenti, Italy: Future of the telescopic printer-rectifier. 
G. Parenti, Italy: Experiments on the gyroscopic recording of the nadir 
point according to the Nistri method. 
K. Schwidefsky, Germany: Zur Charakteristik der neuen Zeiss-Objektive 
für Luftaufnahmen. 
P. Tham, Sweden: Die Auswirkung der Objektiv-Verzeichnungen auf Luft 
bildmodelle. 
E. Weiander, Sweden: A preliminary investigation into the resolving limit 
of aerial photographs.