SALINITY OF OCEAN-WATER AT FOWEY ROCKS, FLORIDA. 309 



Content of chloride, salinity, and specific gravity of ocean-water at Fowey Rocks, Florida — Con. 



Date of 

 collection. 

 1914-1915. 



Condition 

 of tide. 



Wind. 



Dli 



Velocity. 



Condition of 

 weather. 



Precipi- 

 tation at 

 Miami. 



Content 

 of chlo- 

 ride. 



Salin- 

 ity. 



Specific 

 gravity 

 (0/4)°. 



Sept. 26 

 27 



Oct. 



29 

 30 

 I 

 2 

 3 

 4 

 5 

 6 



7 

 8 



9 

 10 

 II 

 12 

 13 

 14 

 15 

 16 



17 



Falling. . . . 



..Do 



..Do 



Half-tide.. 



Falling 



..Do 



Low 



..Do 



Rising. . . . 



..Do 



Half-tide . . 



..Do 



Rising. . . . 



High 



..Do 



Falling 



Rising. . . . 



..Do 



..Do 



..Do 



..Do 



Low 



E.... 



E.... 



E.... 



ESE. 



ESE. 



SE... 



SE... 



SE... 



SE... 



SE... 



SE... 



SE... 



SE... 



N..., 



NE... 



NE.., 



E 



E 



Calm. 



E 



E 



E 



Strong 



Fresh 



Do 



Strong 



Fresh 



Do 



Light 



Do 



Moderate 



Light 



Light breeze. 



Squally 



Light 



Gale. . . . 

 ....Do. 

 Strong . . 

 Light. .. 

 Calm . . . 

 Light . . . 

 ....Do. 



Cloudy 



Do.... 



Rain 



Cloudy 



Do.... 



Do.... 



Do.... 



Do.... 



Do.... 



Do.... 



Do.... 



Do.... 



Do.... 



Do.... 



Overcast . . . 



Cloudy 



Partly clear. 



Clear 



Do.... 



Do.... 



Do.... 



Do.... 



O.OI 



.16 



.26 



•31 



gms. 

 ■per kg. 

 19.71 

 19.71 

 19.65 



19-73 

 19.80 

 19.83 

 19.83 



gms. 

 per kg. 

 35-6i 

 35.61 

 35-50 

 35-64 

 35-77 

 35-82 

 35.82 



1.02862 

 1.02862 

 1.02853 

 I . 02864 

 1.02875 

 1.02879 

 1.02879 



.29 

 •14 



Trace. 

 .01 

 .63 



Trace. 

 .04 



-34 

 .02 

 .01 

 •39 



19.84 



19-93 

 19.92 

 19.92 

 19.96 



20,04 

 19.98 

 20.00 

 20.00 

 19.99 



19.93 

 19.91 

 19.90 

 19.92 



35 •84 

 36.00 



35 99 

 3599 

 36.06 

 36.20 

 36.09 

 36.13 

 36.13 

 36.11 

 36.00 

 35-97 

 35-95 

 35-99 



1.02880 

 1.02894 

 1.02892 

 1.02892 

 1.02898 

 I. 02910 

 I. 0290 I 



1.02904 

 1.02904 

 1.02902 

 1.02894 

 1.02891 

 1.02889 

 I . 02892 



DETERMINATION OF CHLORIDE. 

 Chloride was estimated by titrating a measured sample of sea-water 

 with a solution of silver nitrate in the presence of potassium chromate 

 indicator by means of the salinity outfit supplied by the Copenhagen 

 Laboratory of the Conseil permanent international de la Mer. Use of 

 this apparatus was obtained through the courtesy of the United States 

 Bureau of Fisheries. An essential part of the apparatus is a calibrated 

 burette so graduated that its reading is approximately grams per kilogram 

 of chloride if 15 cubic centimeters of sea-water is titrated with a solution 

 containing about 37 grams per liter of silver nitrate. A float in the burette 

 assists in estimating tenths of the smallest divisions. The strength of the 

 standard solution of silver nitrate is determined by carefully analyzed sealed 

 tubes of standard sea-water supplied by the Copenhagen Laboratory as a 

 necessary part of the outfit. The apparatus is designed and constructed 

 with the object of attaining maximum accuracy in titration. Special precau- 

 tions observed in titration are precise measurement of the sample in an 

 automatic pipette, vigorous stirring of the liquid by means of a glass rod 

 flattened at the end, and observation of exactly similar tints as end-points. 



CALCULATION OF RESULTS. 

 The results of the titrations were corrected and calculated by means 

 of Knudsen's tables.^ The corrections for removing the error caused by 

 the difference in volume of equal weights of sea-waters of different salinity 

 are applied as follows: 



'Knudsen, Martin, Hydrographic tables, Copenhagen, 1901. 



