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F. J. Worton, Fairey Air Surveys Limited, England, in a company technical re- 
port No. V.20, 1959 reports his findings of "The Vibrational Characteristics 
of the Wild RC 5a and the Eagle IX Camera Mounting when used in a Piston Engined 
Aircraft." The practical flight test was made to measure the vibration of the 
Dakota aircraft camera support structure and to determine the degree of iso- 
lation afforded by the camera mounting. 
The aircraft was flown at night at right angles to a line of fixed lights and 
a 100 cycle per second flashing light. Runs were made over a range of engine 
revs and boost settings that might be used during survey photography. The 
100 OPS flashing light provided the frequency time base and amplitude was 
determined by precise measurement of image displacement. 
Worton concludes that (19 years ago) the (then) existing camera mountings were 
"just coping" with the vibrations of the Dakota aircraft which was faily re- 
presentative of the aircraft then in use for survey work. 
The "Airborne Camera Environment" is reported by Worton in the October 1977 
Photogrammetric Record as being entirely different from that of the Camera 
Calibration Laboratory where the elements of interior orientation are obtained. 
His data were obtained from two flights to 7000 meters altitude by instru- 
mentation of fourteen areas. These were as follows: 
Temperatures at: 
1. Outside of filter 
2. Inside of filter 
Lower lens flange 
4 — O 
Central lens casting 
5. Upper lens flange 
Focal plane pressure plate 
7. Magazine contained air 
8. Outside camera window 
9. Inside camera window | 
10. Camera bay ambient air 
11. Aircraft outside air 
Relative Humidity at: 
1. Magazine contained air 
2. Camera bay ambient air 
Aircraft altitude 
19