clearly labeled, and should be as automatic as possible. His duties should be planned, not to throw certain switches at given times according to a check-list (a timer can do the job better), bet rather to adjust apertures in accordance with prevalling light levels and to chase and correct trouble when it occurs. The installation should try to do him out of his job. 8.4 DIVIDED ASSIGNMENTS OF AIRCRAFT . Requirements of several programsfor the use of a given aircraft inevitably conflict. The position of the plane is the perpetual quarrel—-some want it close in, and some want it far away; some high, and some low, ard so on. There should be onough planes in the program to satisfy everyone without forcing compromises between the "near-inners" and the "far—outers" in the use of a single plane. This is a-partiowarly heartfelt recom mendation; much valuable data were lost during the operation because the planes were closer to ground zero than desired. This always resulted in. cloud images extending be~ yond the edges of the picture. 8.6 CAMERAS It is recommended that a study be made to find a more~satisfactory camera for these purposes. The modified K-17C cameras are heavy and bulky and are subject to shutter malfunction. The resulting images are sometimes superb, but aro more frequently _ worthless, owing to hangover of the shutter. However,-picture quality usually is lmited by natural cloud interference, the diffuse and nebulous edges of tho atomic cloud, and low light levels. Large images with high resolution are nice to work with but simply are not nocessary; it is better to accept smaller images from a more-reliuble camera. On theothor hand, it is felt that the 35-mm motion-picture camera is tho minimum frame size; n 70-mm frame should be about right. ’ The 70-mm frame should be arranged horizontallyto rive a pleture about 24 inches high and 314 inches wide. Lenses should be available in 3-Inch, 4-inch, and 6-inch focal lengths and of as wide an aperture as possible. The-camora should hold at least 20 feet of film, for a total of 60 pictures. Each installation is visualized as using two 70-mm cameras: Tho first uses slow film and takes one picture every second during the time fireboll light is shining; the other uses fast film to photograph with the pr availing sky light. The second camera works on a pro— gram of increasing time intervals, such as six pictures per minute for 5 minutes, one per minute from plus § to plus 20 minutes, and one every 5 minutes thereafter. The cameras shotld be placed on stabilized mounts of the type employed so sucoonafully during Operation Castle. 40 SECRET NO eee Re I AE oe Megee