MELLEN: SOUND PROPAGATION IN A RANDOM MEDIUM 



is: have we seen evidence that is statistically significant after 

 we have subtracted off all of these things? 



Dr. Mellen: You still don't believe the boron? 



Dr. Goodman: I haven't seen any error analysis. 



Dr. Smith: I want to suggest in that same vein that it is very 

 difficult to establish confidence. We need all the measurements we 

 can get, not just total integrated transmission loss. An experiment 

 should be planned to make other measurements of transmission, whether 

 it be signal envelope, coherence, directionality, or whatever. By 

 using that information as well as the transmission loss and testing 

 the results against a model for the physics of the situation, one's 

 confidence would be increased. 



Mr. R. L. Martin (New London Laboratory, Naval Underwater 

 Systems Center) : I believe that the original work that Bill Thorp 

 did at least prior to 1968 did not use total energy at all. He looked 

 at the peak envelope of the classic SOFAR arrival, and he was just 

 concerned with the amplitude of that envelope and how that changed 

 with range. 



He did not use the total energy, but he did make a comparison 

 of the two methods in the PARKA exercise and they came out with the 

 same results. 



I just bring up that point to indicate he initially dealt only 

 with those rays that were very close to the axis. 



Dr. Smith: Some of his work I thought he time-gated and then 



got the energy in what he thought was ducted. 



Mr. Martin: Not his initial work though. 



Dr. Mellen: All the later stuff was total energy in the window. 



419 



