i 



exposures were made at a recycling rate of 4 seconds. Ten sucli runs were 

 madej and the end result was that each camera (figure 4,3) had taken 100 

 pictures. At the same time, the ATLAlsfTIS ^7<ra.s recording waves, and the 

 variable distances between the sonobuoy and the ship. 



At the conclusion of the program, the ship was securedj and the planes 

 headed for NAS Anacostia where the film was processed at the U. S, Naval 

 PhotograpMc Center. The stereo-photographs were then turned over to 

 HYDRO for preliminary analysis. 



The success of the venture of 25 October 1954 is in no small part due 

 to a practice test made some weeks earlier. The numerous "bugs" which 

 were exposed and corrected could each have meant certain farilure if they 

 had gone undetected. Photography of a jeep traveling at 40 mpk on the NADU 

 runway established the recycling rate of the cameras and the efficiency of the 

 FM liiik. The photo hatch, in one plane, obscured the fiducial marks on the 

 photographs and the camera mount had to be modified. A run over a pre- 

 scribed route indicated that altitude and station keeping of the planes required 

 more attention. The following week, a second test was made and the results 

 indicated that all gear was in good operating order. A detailed account of 

 tlie operational technique appears in the literature, Marks and Ronne [1955] 

 s.-rid Marks [1955], 



References to Part 4 



Marks, W. , [1955]: Contouring the §ea. Surface. Research Review , pp. 

 12=16, March. 



MarkS;, W. and F. C. Ronne, [1955]: Aerial Stereo-Photography and Ocean 

 Waves. Photog, Eng. v. 21, no. 1, 107-110, March. 



30 



