DREDGING AND HYDROGRAPHIC RECORDS. 

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



33 



Temperatiwe. 



'F. 



55.00; 



I 

 52.50, 



54.00, 



53.00 

 53.00 



.54.00 



.54.00,. 

 55.00, 



55.00!. 



Salinity. 



Surf. 



Botm. 



Apparatus. 



3' Tnr.; 19" dr. 



.do. 



3' rnr.; 19" dr. 

 do 



19" dr. 



3' Tnr.; 19" dr. 



.do. 



.do. 



.do. 

 .do. 

 .do. 



.do. 



.do 



.do 



.do. 



Trial. 



Depth. 



botm. 



.do. 



botm. 

 ...do.. 



..do... 



botm... 



...do.... 



.do. 



...do. 

 ...do. 

 ...do. 



.do. 



...do... 

 ...do... 



Dura- 

 tion. 



Min. 



-do. 



" For 1 mile 



33 



28i 



29 



54 

 20i 



16 

 16 



10 

 7 



20 

 16 



5 



3i 



22J 

 16 



Drift. 



Direction. 



286° 

 317° 



129i° 

 241 °.i 



86° 



Mi. 

 0.62 



313° 



128° 



148° 



264° 



0° , 



263i° 



112° 



99J° 



3.87 

 1.7 



3.00 



1.4."> 



.7 



.38 



.6 



.87 



.63 



Remarks. 



Ebb and flood. Op- 

 erations conducted 

 through change of 

 tide from launch. 

 Ran down on NE. 

 and E. shore of 

 Angel Id., 25-50 

 yds. offshore. Dr. 

 down as indicated 

 by black lines on 

 chart. 



Ebb and flood. Op- 

 erations conducted 

 through change of 

 tide from launch. 

 Ran along S. shore 

 of Angel Id.; dr. 

 down as indicated 

 by black lines on 

 chart. 



Flood. Operations 



conducted from 



launch. 

 Ebb. Operations 



conducted from 



launch. 



Flood. Operations 

 conducted from 

 launch; beam trawl 

 lost in beginning. 



Flood. Operations 

 conducted from 

 launch. No botm. 

 samples taken. 



Ebb. Along N. side 

 Golden Gate. 

 Both drs. caught 

 frequently. Run 

 with 3' Tnr. over 

 same ground May 

 8, 1912. 



Ebb. Operations 

 conducted from 

 launch. 

 Do. 



Do. 



Flood. Operations 

 conducted from 

 launch. vS tones 

 covered vnth bar- 

 nacles and bryo- 

 zoas. 



Flood. Operations 

 conducted, from 

 launch. 

 Do. 



Do. 



Do. 



