This Navy-NDRC radio te- 

 lemeter receiving equip- 

 ment permits scientists 

 miles away to follow the 

 performance of un- 

 manned planes flying 

 through the explosion 

 area. Eighteen amplifier 

 channels decode and 

 magnify the information 

 radioed automatically 

 from the drone planes. 

 Permanent records are 

 provided by the oscillo- 

 graph, shown at the rear. 



Radio-controlled drone boats were used to traverse the target area 

 after each test, take samples of lagoon water, and send back informa- 

 tion as to extent of radioactivity encountered. Smoke signal equipment 

 may be seen overhanging the stern. The boats were guided by trans- 

 mitters aboard the BEGOR. 



Plate 7 



