obtained both during the test flights for SWOP and the actual project flights. 

 We wanted immediate development of the test flight film in order to be able 

 to check out the photographic system. The PZV's were to land at Anacostia 

 immediately after flying the test hop so that the films could be developed at 

 the NPC and inspected by someone from the Photogrammetry Division of the 

 U. S. Navy Hydrographic Office for accuracy with a mininaum of delay. The 

 test flight was planned for the third week in September. The results of the 

 analysis of the test data and of the data finally obtained are described by 

 members of the staff of the Photogrammetry Division of the U. S. Navy 

 Hydrographic Office in Part 6. 



The flight check showed that one of the two cameras sent to Johns ville 

 for installation was defective. Luckily we had originally asked for four 

 cameras so we had spares to fall back on. The Photogrammetry Division 

 at Hydro checked these cameras for us and were able to find two good 

 cameras for us out of the four BuAer had originally sent. 



On September 16th a letter was sent from ONR to Hydro asking for 

 their assistance in providing the required wave forecast. This request 

 was made supplementary to the request for services from the Photogram- 

 metry Branch and was intended to be part of the same project. Hydro, of 

 course, agreed to provide these additional services. This aspect of the 

 work is also discussed in Part 5. 



On the 29th the test flight was made. I was waiting at the field at Ana- 

 costia for the PZV's to arrive. It was slightly after the desk workers quit- 



