lead plane fills a certain portion of the following plane's gunsight. 

 If this condition is maintained in flight, then the baseline is known, 



4. The Photogrammetry Division of HYDRO asked for a practice run 

 over a specified course to provide an evaluation of the photography, 



5. Two weeks was set as the maximum operating time once the field work 

 started. 



6. The cameras were to be sent to WHOI to facilitate preparation of the 

 FM link. 



7. The aircraft are committed to the use of an A-priority group and 

 will not be forthcoming without the consent of this group. 



8. A tentative meeting was scheduled at NADU for a final evaluation of 

 plans after the planes were fully instrumented. 



During the month of August, a U. S. Navy photographer first class was 

 assigned to the projects ONR secured all the equipment asked for, and the 

 jiydrographer committed the Photogrammetry Division to the stereo analysis 

 job. The FM link was satisfactorily completed and installed, and a groixnd 

 check was miade. It was found that the FM link could trigger the cameras 

 within one millisecond of each other (Walden [1955]). This was an iraprove- 

 ment over the similar French instrument. 



The final coordinating rneeting was held at NADU on 19 August 1954. All 



of the mechanics were ironed out, and assignments were given to the various 



cooperating groups to b# eonripleted by the test date, tentatively set for 24 



September. All groups received copies of the procedure for the test run and 



the actual exercise (Marks [1954b]). 



24 



