DREDGING AND HYDROGRAPHIC RECORDS. 

 Francisco Bay, Calif., 1912-13, and March, 1914 — Oontimied. 



31 



Temperature. 



F. 

 50.5 



55 



Salinity. 



Surf. 



Botm 



Apparatus. 



Trial. 



Depth. 



Drift. 



Dura- 

 tion. 



Direction. 



Remarks. 



F. 

 52.00 



52.00 



58 



52 



59. 



62 



52.00 



50.00 



50.00 



51.00 



.52.00 

 53.00 



49.00 

 49.00 



3'Tnr.; 19" dr 



3' Tnr.; 19" dr. 



3'Tnr.; 19" dr. 



.do... 



.do. 



botm. 



botm. . . 



botm. 



..do.... 



-do. 



.do. 



3'Tnr.; 19" dr 



.do.. 

 .do.. 



.do. 



botm. 



.do., 

 .do.. 



.do. 



.do. 



.do. 



.do. 



3'Tnr.; 19" dr 



.do. 



botm. 



.do. 



o For 0.9 mile. 

 51700°— 21 10 



Min. 

 13 

 9 



47 

 16§ 



21 



10 



110 



120°., 



140°., 



299°.. 

 77°. . . 

 332°.. 

 127°.. 



5ti°... 

 92°... 



i.r°. 



325° 6 

 73°... 



73°... 

 130°.. 



42°... 



1.1 



* For 1.8 mile. 



Flood. 



Flood. 



Flood. 



Ebb. Operations 

 conducted from 

 launch. 



Flood. Operations 

 conducted from 

 launch. 



Ebb. Operations 

 conducted from 

 launch. 



Ebb. Operations 

 conducted from 

 launch. 



Do. 



Flood. Operations 

 conducted from 

 laimch. 



Flood and ebb. Op- 

 erations conducted 

 through change of 

 tide from launch. 

 Do. 



Hauled twice on run, 

 but before third 

 haul, dr. was lost 

 with 20 fms. line. 

 Flood. Operations 

 conducted from 

 launch. 



Ebb and flood. Op- 

 erations conducted 

 through change of 

 tide from launch. 

 Places dredged are 

 indicated on chart 

 by black line. En- 

 tire run is indi- 

 cated by dotted 

 line. Dr. down 

 twice on this run, 

 then ran over in 

 same direction. 

 Dredged oflf sand 

 beaches in only 

 two places. 



