page 74 



PREFACE TO PRECISION. On 



a Boeing F- 1 3 plane altered for 

 use as a photographic ship two 

 motion picture cameras are in- 

 stalled in one of the plane's 

 gun turrets. These cameras were 

 controlled from the top fire 

 control blister shown in the 

 background by the same sight- 

 ing and firing mechanisms nor- 

 mally used with the plane's ma- 

 chine guns. Shown here at Ros- 

 well Field, New Mexico, are 

 Corporal Harold Johnson, out- 

 side the plane, making adjust- 

 ments on the cameras, while 

 Sergeant Henry R. Zarnoski 

 mans the controls in the top 

 fire control blister. In the back- 

 ground can be seen another 

 turret, slotted cover in place, 

 housing a similar motion picture 

 camera installation. 



FOCUS ON PHOTOGRAPHY. Brig- 

 adier General Roger M. Ramey, 

 Commander Task Group 1.5, dis- 

 cusses Army Air Forces photographic 

 plans with Colonel Paul T. Cullen, in 

 charge of technical photography at 

 Kwajalein. In the foreground are 16 

 and 35mm type motion picture cam- 

 eras, operated at 2000 frames per 

 second, such as are used in the F- 1 3 

 photographic ships. The extreme hu- 

 midity at Bikini presented a serious 

 problem to aerial photographers: as 

 a plane descended and the air pres- 

 sure in the plane increased, there was 

 a tendency for moisture to condense 

 on the photographic film, hurting the 

 emulsion. To avoid this, pilots de- 

 scended very slowly, sometimes over 

 a period as great as an hour. In many 

 planes the difficulty was avoided by 

 installing the cameras in constant- 

 pressure chambers. 



