(69) 
(71) 
((74) 
(75) 
(77) 
(78) 
(80) 
(81) 
(83) 
(84) 
(85) 
(86) 
(89) 
(89) 
(91) 
(92) 
(94) 
(96) 
(98) 
(99) 
(100) 
(100) 
(102) 
(103) 
(105) 
(106) 
(108) 
(135) 
(166) 
(167) 
(170) 
(176) 
(177) —1 
(177)—5—1 
(177)—10—1 
(177)—19—1 
(179) 
(179) 
P. L. Pryor Progress Recents en Optique et en Sensitometrie . (180) 
L. A. Williams Applications des Papiers à Contraste Variable 
à la Photographie Aérienne de Reconnaissance . . (180) 
U. K. Heidelauf The Vertical Problem in Aerial Photography (181) 
U. K. Heidelauf Le Problème de la Verticale en Photographie 
Aérienne ........ (186) 
Address of Captain Reading at the Farewell Banquet of the 
International Society of Photogrammetry, 15 Septem 
ber 1952 (188) 
Allocution du Captain Reading au Banquet d’Adieu de la Société 
Internationale de Photogrammétrie, 15 septembre 
1952 (189) 
Address of Prof. Dr. W. Schermerhorn at the Farewell Banquet 
of the International Society of Photogrammetry, 15 
September 1952 ....... (192) 
Allocution du Professeur Dr. W. Schermerhorn au Banquet 
d’Adieu de la Société Internationale de Photogrammé 
trie, 15 septembre 1952 ...... (193) 
Address of Prof. Hallert at the Farewell Banquet of the Inter 
national Society of Photogrammetry, 15 September’52 (195) 
Allocution du Professeur Hallert au Banquet de la Société In 
ternationale de Photogrammétrie, 15 septembre 1952 . (195) 
Speech of General L. Hurault at the Closing Dinner of the VII 
International Congress of Photogrammetry . . (197) 
Allocution Prononcée par le Général Hurault au Diner de Clo 
ture du Vllème Congrès International de Photo 
grammétrie ........ (198) 
COMMISSION I 
Report of Commission I (Photography and Navigation) . . (200)-l 
The Sessions of Commission I ...... (201) 
J. E. R. Ross Shoran Operations in Canada .... (218)—1 
F. E. Washer The National Bureau of Standards Resolution 
Test Chart of 1952 ....... (219) 
L. C. Gardner The Experimental Evaluation of Lens Perform 
ance (224) 
Astrophotographical Examination of Objective Lenses . . (228) 
W. A. Brucklacher A Contribution to the Navigation of Photo- 
flights Covering Large Areas ..... (228)-l 
Officine Galileo Methods and Equipments for Calibrating 
Photogrammétrie Cameras ..... (229) 
G. C. Tewinkel Adjustment of the Nine-Lens Aerial Camera 
of the U.S. Coast and Geodetic Survey . . . (233) 
J. Cruset Aerial Photography by the Groupe des Escadrilles 
Photographiques Belonging to the Institut Géographi 
que National ........ (236) 
/. Cruset Description, Methods of Control and Applications in 
Aerial Photographic Surveying of a Device Enabling