{a) Step 1. — Using a pair of dividers, enter 

 Sheet A (H. O. Misc. 15,078-A, Pressure Cor- 

 rection to Specific Volume Anomaly), on the 

 vertical line for depth (2,000 meters), placing 

 one point of the dividers on the 35.00 "/oo 

 salinity line and the other point on the 0° C 

 temperature line. These two lines are parallel. 



(6) Step 2. — Next, without changing the 

 spacing of the dividers, move them up the 

 2,000-meter line until the lower point is at the 

 given salinitv (34.94). The upper point now 

 will be slightly above the 0° C. line. 



(c) Step 3. — Pivot the dividers on the upper 

 point, swinging the lower point around to the 

 2,000-meter line and placing it on the given 

 temperature (3.50°). The space between the 

 points is the total correction for temperature, 

 pressure, and salinity for the unknown Specific 

 Volume Anomaly (5). 



{d) Step 4- — Select the Specific Volume Anom- 

 aly diagram having the proper combination of 

 temperature and salinitv. In this case, it is 

 Sheet 9 (H. O. Misc. 15,078-9). 



{e) Step 5. — Without changing the correction 

 spacing of the dividers, enter the sheet at the 

 given salinity (34.94) and move up that 

 vertical line until the lower point of the dividers 

 is at the given temperature (3.50°). 



(/) Step 6. — With the lower point of the 

 dividers at the intersection of the given temper- 

 ature and salinity, place the upper point along 

 the vertical salinity line and read the Specific 

 Volume Anomaly (5) along the nearest hori- 

 zontal line. In this case, the reading is -f47. 



{g) Step 7. — Record this value in the d column 

 of the log sheet for the 2,000-meter depth. 

 The above steps must be repeated for each 

 standard depth of the station. 



14-149 Mean 5. — The mean value of the 

 Specific Volume Anomaly, 8, between each 

 two successive depths, is computed from the 

 values given in the 6 column, and recorded in 

 this column. 



14-150 Ai5.— The AD is the anomaly of 

 dynamic depth for each layer in dynamic 

 meters. This is obtained by multiplying the 

 Mean 8 by the difl^erence in standard depth 

 between the successive samples. The latter 

 value is called the pressure interval. 



Note. — The values recorded in the 5 and Mean 5 

 columns are abbreviated. The actual value for +47, 

 in the above e.xample, is 0.00047. Thus, the correct 

 AD, to 4 decimal places, is obtained as follows: AD = 

 0.00001 (Mean 5) (pressure interval). 



14-151 SAZ>. — This column contains the 

 cumulative sum of the anomalies of dynamic 

 depth of the layers above, as given in the AD 

 column. The XAD for the surface is always 

 0.0000 and is printed so in the first line of 

 the column. 



Record the first value from the AD column 

 on the second line of the SAZ? column; add the 

 second value in the AD column to this and 

 record the sum on the third line of the 2AD 

 column. Continue adding successive AD values 

 to this cumulative sum on down the column. 



14-152 02inl./l. — ^From the graph con- 

 structed with the Observed Values, read the 

 dissolved oxygen content for each standard 

 depth and record the value in this column. 



14-153 Blank Columns.— The two blank 

 columns are provided to record the values, at 

 standard depths, of any observations which 

 may be given in the blank columns under 

 Observed Values. 



OCEANOGRAPHIC LOG SHEET GEK 1, PRNC-NHO-1336 



(Rev. 7-53) 



ELECTROMAGNETIC CURRENT OBSERVATIONS 



14-154 GENERAL REM ARKS.— The GEK- 



1 sheet is used to record surface current data 

 obtained with the Geomagnetic Electrokineto- 

 graph (GEK). Instructions for operating the 

 GEK are given in chapter 9. Study those 

 instructions carefully before using this log sheet. 



14-155 THE LOG SHEET.— A sample log 

 sheet is shown in figure 14-8. Print all entries 

 accuratelv and neatly. 



14-156^ The Log Sheet Headings.— Fill in 

 the ship's name and number, cruise name and 

 number, and the GEK instrument number in 

 the proper spaces. 



14-157 The Log Sheet Columns.— The log 



sheet columns are filled in accordance with 

 instructions given below. One line is used for 

 each current fix. 



14-158 GEK Serial No.— Record the con- 

 secutive number for each current fix, commenc- 

 ing with the numeral 1 for the first fix of 

 each cruise. 



14-159 Date. — Give the day, month, and 

 year. Abbreviate the month by using the first 

 three letters. Use the last two digits of the year. 

 The change of date is determined bj^ Green- 

 wich mean time (GMT). 



H. O. 607 



151 



