APPENDIX B: CODE USED TO TRANSMIT 

 ENVIRONMENTAL INFORMATION DURING 

 BERING AND CHUKCHI SEAS EXPEDITION, I960 



As noted in the main text, a special, prearranged 

 code was used to transmit sea-floor environmental informa- 

 tion by radio from the R/V HUGH M. SMITH to the following 

 ships. Two such messages were actually sent for two 

 survey lines, S and S , in the Bering Sea. The third line, 

 S , in the Chukchi Sea, was not surveyed because of the ice 

 pack which was encountered about 50 miles farther south 

 than anticipated. 



The following memorandum is reproduced verbatim 

 from records of the expedition: 



June 196 



From: E. L. Hamilton To: K. V. Mackenzie 



Subject: Transmission of information, Summer 1960. 



Tracks: S 



'A"; S c 



'B"; S, 



'C". 



2. Point along track in nautical miles from the south end 

 follows track letter. 



Ex: A6 7 = track A, 6 7 miles from south end. 



3. Sediment thickness in feet. 



T" followed by numbers in feet. 



TI = thick sediment section with no prominent 

 reflectors. 



TX = no thickness figure available. 



TR = rock at surface. 



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