(30) 
Sweden 
Service 
Normal 
Aircraft 
Ceiling 
Speed 
Duration 
Crew 
Focke Wulfe “Weihe” 
5,000 m 
220 km/h 
6 hrs. 
3 
(16,000 ft.) 
(140 mph) 
NC-701 “Siebel” 
7,500 m 
350 km/h 
5 hrs. 
4 
(25,000 ft.) 
(220 mph) 
Switzerland 
Service 
Normal 
Aircraft 
Ceiling 
Speed 
Duration 
Crew 
Beechcraft C-45F 
6,000 m 
190 km/h 
5J hrs. 
2 or 3 
for RC-5 and RC-7 
(20,000 ft.) 
(120 mph) 
Percival P-54 
7,100 m 
210 km/h 
7 hrs. 
2 or 3 
for C2 and RC-7 
(23,000 ft.) 
(130 mph) 
Messerschmidt M18D 
5,000 m 
130 km/h 
4 hrs. 
2 
(in reserve) 
(16,000 ft.) 
(80 mph) 
United States of America 
Service 
Normal 
Aircraft 
Ceiling 
Speed 
Duration 
Crew 
Boeing B-17 
30,000 ft. 
150 knots 
9 hrs. 
9 
(175 mph) 
Piper Tripacer 
10,000 ft. 
100 mph 
5 hrs. 
2 
Cessna (single engine) 
18,000 ft. 
160 mph 
4 hrs. 
2 
Cessna (twin engine) 
22,000 ft. 
180 mph 
5 hrs. 
2 
Beechcraft (single engine) 
25,000 ft. 
180 mph 
5 hrs. 
2 
Beechcraft (twin engine AT-11).. . 
21,000 ft. 
170 mph 
5 hrs. 
2 or 3 
Lockheed P-38 
36,000 ft. 
350 mph 
3| hrs. 
2 
The U.S.A.F. use a variety of military aircraft for which performance data 
is restricted. 
V. INSTALLATION AND OPERATING CONDITIONS 
Introduction 
The extensive use of camera mounts in which the method of vibration 
isolation lags behind present knowledge of the subject suggests that camera 
vibration is not an important problem in survey photography. This probably 
arises partly from the relative insensitivity of short focal length cameras to 
vibration and partly from the relatively mediocre resolution acceptable in much 
photogrammetry. The occasional omission of a camera port glass has the same 
implication, since air entering through the open port contributes to camera 
unsteadiness. 
The number of cases in which camera temperature is not controlled is 
rather surprising, since low temperature has harmfull effects on emulsion speed, 
film dimensions, and camera dimensions. It also presents the camera manu 
facturer with unnecessary design difficulties in ensuring reliable operation. 
Australia 
In Australia the camera is held in a rigid mount behind a camera port glass. 
Photography is done only in clear weather and the exposure is determined by the 
experience of the camera operator. The usual shutter speed is 1/300 of a 
second and usual apertures are f:8 or fill. Photographic altitudes for the 
Commonwealth photography were 25,000 ft. or 15,000 ft.