14-102 STANDARDIZATION {N)-iA\= 



a. — Star.dartlizatioii is tlu" process of determin- 

 ing the difference between the concentration of 

 the silver nitrate solution (A) which is used for 

 titrating the sea water samples, and the clilo- 

 rinity of a standard (A'^) which is exactl.y known. 

 This difference is called alpha (a). It is used 

 to determine the correction k that is applied to 

 the Average Burette Reading to obtain chlorin- 

 ity of the sea water samples. The formula used 

 to determine alpha is: lN)—{A) = a. 



The standard (A'^) used is known as standard 

 sea water. By international agreement, stand- 

 ard sea water is produced only by the Associa- 

 tion d'Oceanographie Physique, Depot d'Eau 

 Normale, Chariot tenlund slot, Charlottenlund, 

 Danemark. This water is put up in flame- 

 sealed glass tubes. Each tube contains ap- 

 proximately 200 ml. of water, and the exact 

 chlorinity, to 3 decimal places, is given on the 

 label of each tube. 



Standardization titrations must be run before 

 titrating the sea water samples. At least three 

 titrations must be run for the first standardiza- 



tion of each station. Record these at the first 

 asterisk (*) shown on the log sheet. At least 

 one titration must be run at each of the other 

 points indicated by the asterisks. As in all 

 chlorinity titrations, these values must agree 

 within 0!02. 



14-103 Cl7oo of Standard (N).— Record 

 the chlorinity of the standard sea water used 

 for the standardization titrations. This should 

 be given at each point indicated by asterisks. 



14-104 Am't. of AgNOsC^).— Record in this 

 column, the reading of the Knudsen burette for 

 the amount of silver nitrate solution used to 

 titrate each sample of standard sea water. 



14-105 a. — Record in this column, the alpha 

 (a) for each standardization titration. The 

 alpha is determined by the formula (A'^) — (^) = 

 a. Compute the average alpha for each set of 

 standardization titrations and record it in this 

 column, as shown in figure 14-5. 



14-106 Remarks. — Record in the Remarks 

 column any information that will aid persons 

 analyzing the data after the cruise. 



OCEANOGRAPHIC LOG SHEET E, PRNC-NHO-1244 



(Rev. 4-54) 



STATION SUMMARY 



14-107 GENERAL REMARKS.— The E- 



sheet is the sheet on which all data of a station 

 are summarized. The sources of data recorded 

 on this sheet are the A-, C-, and D-sheets. 

 From the observed values recorded on this 

 sheet, graphs are constructed and standard 

 depth values derived. From the standard deptli 

 values, dynamic height anomalies are computed. 

 The meteorological and associated data are 

 coded from the A-sheet. 



14-108 IBM Punch Cards.^The completed 

 data shown on this log sheet are transferred to 

 the F-sheet and thence onto IBM punch cards 

 and processed at the U. S. Navy Hydrographic 

 Office. The processes involved in transferring 

 this data to punch cards are simplified when the 

 data are coded directly on the log sheet. It is 

 therefore necessary that the instructions given 

 below be carefully followed, and all information 

 be recorded properly. All tables referred to 

 are given in part II. 



14-109 The Log Sheet Headings.— The 

 cruise name and number, station number, and 

 name of the vessel are filled in as shown on the 

 A-sheet. Fill in blanks requiringnumeralswith 



the designated number of digits as given in the 

 following instructions (fig. 14-6). 



14-110 Day. — Indicate the day of the 

 month with two digits. If the station was 

 occupied on the third, write 03. 



14-111 Month. — Indicate the month with 

 two digits. Thus if the station was occupied 

 in August, write 08. 



14-112 Year. — Indicate the year with the 

 year's last three digits. Thus, for the year 

 1955, write 955. 



14-113 GMT.— Indicate the Greenwich 

 mean time of the station with two digits. 

 This is the nearest hour as shown by the Start 

 time of the first cast on the A-sheet. Thus, if 

 the Start time is 1930, write 20. 



14-114 Latitude. — Record the corrected lat- 

 itude with four digits, followed by N or S to 

 indicate north or south. Thus, latitude 43°30' 

 north is written 4330N. 



14-115 Longitude. — Record the corrected 

 longitude with five digits, followed with E or 

 W to indicate east or west. Thus, longitude 

 29°39' west is written 02930W. 



H. O. 607 



147 



