6 



DREDGING AND HYDROGRAPHIC RECORDS OF 



pump-filter (con.). .In labeling the collections from this apparatus, contrary to the usual 

 custom, the station number of the position at the end of the haul 

 was applied. This should bo understood to indicate that the col- 

 lection of this apparatus is continuous from the last station number 

 for which the filter is recorded, and the collecting may thus have 

 been continued through intervening numbers. 



op. plank open plankton net, small silk nets of various patterns and sizes, rang- 

 ing from 10 to 16 inch rings. This term includes also the Kofoid 

 nets as elsewhere described. 



Petersen int Cuhn-Pctersen closing net. 



s. d ship's dredge. 



Sig. sdr Sigsbee sounder. 



surf surface. 



surf. 1 old style 4-foot ship's surface net, with no silk lining. 



surf. 2 4-foot ship's surface net, with silk lining. 



surf. 3 conical net 5 feet in diameter, about 10 feet long, A-inch mesh web, the 



lower half lined with 000 silk. 



surf. 4 4-foot net, about 10 feet long, of i-inch mesh web; about one-third 



of the bottom lined with 000 silk. 



surf, tow surface tow net, same as surf. 1 . 



swabs tangle swabs. 



8' Tnr 8-foot Tanner beam trawl. Similarly other lengths of beam. 



Tnr. int Tanner intermediate net. 



Tnr. sdr Tanner sounder. 



therm Negretti and Zambra thermometer, with Tanner case. 



Town, int Townsend intermediate net. 



wat. bot Sigsbee water bottle. 



wng wing-nets, formerly called " butterflies." 



MANNER OF USE. 



No sounding made. 



* signifies depths and character of bottom taken from chart. 



t signifies nets set tandem about 2 fathoms apart. 



^f signifies hauled vertically between depths indicated, then closed. 



% signifies nets towed astern, from taffrail, side by side and about 10 feet apart. 



|| signifies apparatus open, hauled vertically to surface. 



§ signifies apparatus towed (horizontally) at depth indicated by number of minutes given in 

 first period; then hoisted (vertically) to surface, net open, in time next shown. 



(p signifies pump in operation from station at which last emptied, and throughout occu- 

 pation of intervening stations. 



"Character of bottom/' determined by the specimens from the 

 sounding cup, is expressed by symbols, the key to which is appended. 

 Where no sounding is recorded for the station the bottom character 

 may be taken from the chart. 



M....Mud. S Sand. 



Mang. .Manganese. sft . soft. 



Nod... Nodules. Sh Shells. 



Oz....Ooze. sml small. 



P Pebbles. Sp Specks. 



Part. . .Particles. St Stones. 



Pter Pteropods. stky. . .sticky. 



R Rock. vol volcanic. 



rad radiolarian. wh . white. 



rd red. yl yellow. 



rky rocky. 



