DREDGING AND HYDROGRAPHIC RECORDS. 7 



m. b mud bag ("boat drodgo ") usually fastenoH to tail of not or trawl. 



mtr. net 1 meter diameter, OOO-X top, 0-x bottom. 



NZ Negretti tt Zambra reversing thermometer. 



(). p. dr regular commercial orange-peel bucket dredge. 



oys. dr oyster dredge. 



P. X. bot Pettersson-Nansen insulating water l)ottlc. 



Pr. m Price current meter. 



P. S.#9 Plotting sheet No. 9. 



psc per standard compass, magnetic variation not having been applied. 



R (m tables 1911-1915), right thermometer (looking toward instrument); 



(in tables 1919-20), Richter thermometer. 



sdg sounding. 



35^ shr. trl 35-foot shrimp trawl, otter rigged. 



Sigs. bot Sigsbee water bottle. 



Sigs. rod Sigsbee sounding (bottom-sampling) rod. 



5'' sldg 5-foot Tanner beam trawl improved by attaching a broad wooden 



"shoe" to each runner to prevent the frame from sinking in mud 

 too far. 



snap. Id snapper-jawed sounding lead. 



Sp. G specific gravity. 



subm. It submarine light. 



surf surface. 



S V Schmidt-Vossberg thermometer. 



tang tangent . 



therm thermometer. 



3' Tnr 3-foot Tanner beam trawl, including float, tail weight, and sinker 



above the bridle. 



5^ Tnr o-foot Tanner beam trawl, rigged as above. 



9^ Tnr 9-foot Tanner trawl on Agassiz trawl frame. 



Tnr.-Blish sdr Tanner-Blish sounding machine. 



Tnr. cse Tanner reversing thermometer case. 



Tycos Tycos Instrument Co. Fahrenheit thermometer, used m surface work. 



vert, net i meter diameter. No. 6 silk, used for vertical hauls except where 



othermse stated . 



wt weight. 



Jf6 ^ meter diameter, No. 6 silk, surface tow net. 



JJIO I meter diameter. No. 10 silk, surface net. 



^\2 plankton net, No. 12 bolting silk, mounted on 14-inch metal ring. 



#20 (in tables 1911-1915), plankton net. No. 20 bolting silk, mounted 



on 14-inch metal ring. (Lohmann, 1911, states that this num- 

 ber was changed bv the manufacturers in 1907 to "No. 25 bolt- 

 ingsilk.") (In tables 1919-20), 12^^ diameter, No. 20 silk, surface 

 net. 



CHARACTER-OF-BOTTOM ABBREVIATIONS. 



Material : 



C Clay. 



Co Coral. 



E. G Eel grass. 



For Foraminifera. 



G Gravel. 



Glob Globigerina. 



Lav Lava. 



M Mud. 



Mi Mica. 



Oz Ooze. 



P Pebbles. 



R Rocks. 



S Sand. 



Sh Shells. 



Shi Shale. 



Sp Specks. 



St Stones. 



Descriptive adjectives: 



bk black. 



bl blue. 



bn lirown. 



Descriptive adjectives — Continued. 



brk broken. 



CO coral . 



crs coarse. 



dk dark. 



fne fine. 



gn gi'een. 



gran granular. 



gy gray. 



hrd hard. 



m muddy. 



med medium. 



pter pteropod. 



rd red. 



rky rocky. 



s sandy. 



sft soft. 



sh shelly. 



stk sticky. 



wh white. 



yl yellow. 



