DREDGING AND HYDROGRAPHIC RECORDS. 

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



59 



Apparatus. 



oyster tongs; 

 Ek.bot.;Tnr. 

 cse. 



.do. 



4' inter.; #12, 

 #20. 



oyster tongs; 

 Ek.bot.;Tnr 

 cse. 



4' inter.; Ek. 

 hot.; Tnr. 

 cse.; #12, #20. 



oyster tongs; 

 Ek.bot.;Tnr. 

 cse. 



.do. 



4' inter.; #12, 

 #20. 



Ek. bot.; Tnr. 



cse.; 4' inter.; 



#12, #20; Pr. 



m. 

 ....do 



....do 



....do 



....do 



....do 



....do 



Ek. bot.; Tnr. 



cse. ; 4' inter. 



#12, #20; Pr. 



m. 

 ....do 



Trial. 



Depth. 



botm. 

 and 



surf. 



.do. 



surf, 

 and 

 botm, 



botm. 

 and 

 surf. 



surf, 

 and 

 botm. 



botm. 

 and 

 surf. 



.do. 



surf, 

 and 

 botm, 



surf, 

 and 

 botm, 



..do.... 



..do.... 

 ...do.... 

 ...do.... 

 ...do.... 



...do.... 



surf, 

 and 

 botm. 



..do.... 



Dura- 

 tion. 



Min. 



10 



10 



11 

 9i 

 Si 



11 



10 



Drift. 



Direction. 



Anchored 



.do. 



Anchored 



Anchored 



.do. 



Against 

 tide. 



...do... 

 ...do... 

 ...do... 

 ...do... 

 ...do... 



...do 



Against 

 tide. 



Mi. 



Remarks. 



Flood. Dumbarton 

 No. 2 oyster bed, 

 near camp. Opera- 

 tions conducted 

 from launch. 



Dumbarton No. 2 at 

 .some distance. Op- 

 erations conducted 

 from launch. 



Flood. Townet haul 

 between A and B. 

 Operations con- 

 ducted from 

 launch. 



Flood. Mowry oyster 

 bed. Operations 

 conducted from 

 launch. 



Flood. Townet haul 

 in Mowry oyster 

 bed. Operations 

 conducted from 

 launch. 



Ebb. South Bel- 

 mont oyster bed. 

 Operations con- 

 ducted from 

 launch. 



Ebb. South Bel- 

 mont oyster bed; 

 another point. Op- 

 erations conducted 

 from launch. 



Ebb. Townet haul 

 in South Belmont 

 oyster bed. Oper- 

 ations conducted 

 from launch. 



Ebb, 1.80 knots per 

 hr. 



Ebb, 1.23 knots per 

 hr. 



Ebb, 1.31 knots per 

 hr. 



Ebb, 1..50 knots per 

 hr. 



Ebb, 1.74 knots per 

 hr. 



Ebb, 1.88 knots per 

 hr. 



Ebb, 2.89 knots per 

 hr. 



Ebb, 1.39 knots per 

 hr. 



Ebb, 2.05 knots per 

 hr. 



