between 1:15,000 and 1:20,000. The cameras used were the Wild RC-5 and 
RC-7. 5,080 km 2 (2,000 square miles) were photographed for cadastral purposes 
at scales from 1:6,000 to 1:15,000 using the Wild C2, Wild RC-7, and the Zeiss 
double camera. For engineering and forestry 586 km 2 (230 square miles) were 
photographed at scales from 1:5,000 to 1:10,000 using the Wild C2, the Wild 
RC-5, and Wild RC-7 cameras. 
United States of America 
The total area reported to have been photographed from 1948 to 1951 is 
544,000 square miles (1,400,000 km 2 ). 
For topography 517,000 square miles (1,340,000 km 2 ) were photographed. 
Of this 344,000 square miles (890,000 km 2 ) were photographed at scales between 
1:17,000 and 1:47,000 with the most common scale 1:24,000. Cameras used 
for this work were the Fairchild Cartographic, the Fairchild T5, the Mark Hurd, 
the Park, the Aero Service, and the Wes Smith. All these cameras are equipped 
with Bausch & Lomb Metrogon lenses of either 5-2 or 6 inch foccl length. 
52,000 square miles (134,000 km 2 ) were photographed for topography and forestry 
at scales between 1:12,000 and 1:20,000 using various cameras with 9" x 9" 
format and focal lengths of 6 inches or 8| inches. 40,000 square miles (103,000 
km 2 ) were photographed at 1:40,000 with cameras of 6 inch focal length and 
9" x 9" format. 37,700 square miles (98,000 km 2 ) were covered by the nine lens 
camera of the Coast and Geodetic Survey at a scale of 1:20,000. An additional 
35,000 square miles (91,000 km 2 ) was covered at the same scale for the same 
organization using the Fairchild Cartographic camera. The Zeiss RMK-P10 
camera of 10 cm focal length was used to photograph 8,600 square miles (22,000 
km 2 ) at scales from 1:18,000 to 1:36,000. 
For soil conservation purposes 26,000 square miles (67,000 km 2 ) were 
photographed at a scale of 1:20,000 using an Sj" focal length lens and a 9" x 9" 
format. 
For planimetry 830 square miles (2,100 km 2 ) were photographed at a scale 
of 1:40,000 using cameras of 6 inch focal length and 9" x 9" format. 
II. CAMERAS 
Introduction 
New Cameras are the Fairchild T-ll and the Williamson Eagle IX Mark II. 
Some important modifications have been made to other cameras. Descriptions 
will cover these and also all survey cameras in use since 1948 which were not 
described in previous Archives. Where cameras were described by two or more 
National Reporters they are listed under their country of origin. 
Austria 
The Wild cameras used are described under “Switzerland”. The RC-5 is 
fitted with a yellow B filter. Neither camera uses a graded illumination correcting 
filter. 
Australia 
The K17B and OSC cameras employed are well known. They are used with 
minus blue graded density filters.