Jobnson jfunt) 



STATION RECORDS OF THE FIRST 

 JOHNSON-SMITHSONIAN DEEP-SEA EXPEDITION 



By PAUL BARTSCH 

 U. S. National Miiseum; Director of the Expedition 



(With One Plate) 



The Johnson-Smithsonian Deep-Sea Expedition to the Puerto Rican 

 Deep was sponsored by Mr. Eldridge R. Johnson, of Philadelphia, 

 who placed his beautiful yacht Caroline at the disposal of the Smith- 

 sonian Institution and equipped her with the instruments necessary 

 for the work. We were provided with the best of sonic sounding 

 apparatus, thanks to the assistance of the United States Navy, and 

 with an equally efficient winch, water bottles, and thermometers for 

 hydrographic studies, enabling us to work at any depth. A dredging 

 winch suitable for reaching profound depths could not be had within 

 the time available for equipping ; we therefore had installed a tempo- 

 rary winch carrying 6,563 feet of |-inch Special 6x 19 Monitor strand 

 wire rope. This is mentioned merely in explanation of why work in 

 greater depths was not done. In the next cruise this handicap will be 

 obviated. 



The first bearing cited with each station marks the position of the 

 ship at the beginning of the haul, and the second bearing indicates the 

 position at the close of the haul. The bearings were taken by Capt. 

 Andrew H. Peterson and his associated officers : Victor Johnson, chief 

 officer ; Hjalmar Iversen, second officer ; Gunnar Bergersen, third 

 officer. The radio beacon bearings were obtained under the captain's di- 

 rection by Thomas W. Braidwood, senior radio operator, and Louis G. 

 Fullerton, junior radio operator. 



The sonic sounding operations were conducted by T. Townsend 

 Brown, of the Naval Research Laboratory, Washington, D. C., 

 assisted by E. R. Fenimore Johnson, Anthony Wilding, and the 

 Misses Ena and Florence Douglass. The soundings as here cited are 

 unreduced, using as the basis for notation a 400 fathoms per second 

 interval. These soundings will, therefore, when eventually corrected, 

 record a considerably greater depth than here indicated. 



We are deeply indebted to the Hydrographic Office of the United 

 States Navy for the preparation of the accompanying chart. 



Smithsonian Miscellaneous Collections, Vol. 91, No. 1 



