14-116 Sonic Depth.— Record the depth of 

 water, in meters, with four digits. See table 12 

 for conversion of fathoms to meters. 



14-117 Max. Sample Depth. — The maxi- 

 mum sample depth is recorded with two digits. 

 This is the greatest Nansen bottle depth as 

 shown in the Accepted Depth column of the 

 A- and E-sheets. It is recorded to the maxi- 

 mum 100 meters. Thus, if the greatest Ac- 

 cepted Depth is 2,153 meters, record it as a 

 maximum sample depth of 21. 



14-118 Layer Depth (Below Surf.) .--The 

 layer depth of the thermocline below the sur- 

 face is recorded in meters with three digits. 

 Layer depth of the thermocline is defined as the 

 depth from the surface to the top of a sharp 

 negative gradient or, in the case of a positive 

 gradient, the depth of maximum temperature. 

 The layer depth is obtained from the plotted 

 temperature graph. (See sec. 14-141 Plotting 

 Observed Values on Graphs, following.) 



14-119 Type of Bottom.— The type of 

 bottom sediment obtained on station by means 

 of corer, snapper, or other device, is recorded 

 with one digit using the code given in table 7. 

 If no sample is taken, leave it blank. 



14-120 Wind. — The direction from which 

 the wind is blowing is recorded with two digits 

 using the code given in table 8. The 2-digit 

 code is 00 to 36, with 00 indicating calm and 

 36 indicating north; 99 indicating variable or 

 unknown. Thus, if the wind is from 200° T., 

 record it as 20. Wind speed is recorded in 

 meters per second using two digits. To convert 

 from knots to meters per second, refer to table 

 lOA. Round the value obtained from table lOA 

 to the nearest even whole number. Thus, if 

 the wind speed is 12 knots, the table indicates 

 a speed of 06.2 meters per second. Write the 

 value as 06. 



14-121 Wind Force (Beaufort).— If the 

 ship is not equipped with an anemometer to 

 determine the wind speed, estimate the wind 

 force using the Beaufort scale. Record the 

 value with 2 digits using the code given in 

 table 9. When there is no anemometer, do not 

 record speed in meters per second, as outlined 

 above, but only by wind-force code. 



14-122 Anemometer Height Above Sea. — 

 For ships equipped with anemometers, record 

 the height of the anemometer cups above the 

 waterline, in meters, using two digits. 



14-123 Barometer (In mb.).— The baro- 

 metric pressure is recorded in millibars, using 

 two digits. Thus, neglect the 900 or 1,000 

 values. For barometers recording in inches of 

 mercury, use table llA to convert to millibars. 



For barometers recording in millimeters, use 

 table llB to convert to millibars. 



14-124 Air Temp. (° C.).— The dry and wet 

 bulb air temperatures are recorded in degrees 

 and tenths Celsius (centigrade) using three 

 digits. Thus, if an air temperature is 21.7° C. 

 write it as 217. For ships equipped with only 

 Fahrenheit thermometers, use table 13A to 

 convert to Celsius. 



14-125 Humidity. — Relative humidity is 

 recorded in percent, using two digits. If rela- 

 tive humidity is 100 percent write as 99. To 

 compute relative humidity, refer to table 14. 



14-126 Weather.- Record the state of the 

 weather, using the 2-digit code given in table 1. 



14-127 Clouds. — Record the significant 

 cloud type, using the single-digit code given in 

 table 2. Indicate the amount of sky covered 

 using, the single-digit code given in table 3. 



14-128 Sea. — The direction from which the 

 wind waves (seas) are coming is recorded in 2 

 digits, using the code given in table 8. The 2- 

 digit code is 00 to 36 with 00 indicating calm 

 and 36 indicating north. Record the sea 

 amount, using the single-digit code given in 

 table 5. 



14-129 Swell. — The direction from which 

 the predominant swells are coming is re- 

 corded in 2 digits, using the code given in table 

 8. Record the swell amount using the single- 

 digit code given in table 6. 



14-130 Visibility. — Record the condition of 

 visibility, using the single-digit code given in 

 table 4. 



14-131 Wafer. — Record the color descrip- 

 tion of the water, at each daylight station, using 

 the Forel scale as given by the 2-digit code in 

 table 15. The transparency of the water, as 

 determined in meters by Secchi discs, is re- 

 corded in two digits. If both white and black 

 Secchi discs are used, record the reading of the 

 white disc first and the black second, separating 

 the two figures with a dash. 



14-132 OBSERVED VALUES COLUMNS.- 

 The Observed Values columns are filled in as 

 follows. 



14-133 Serial No. — The serial numbers are 

 obtained from the Serial No. column of the 

 A-sheet. 



14-134 Accepted Depth. — The accepted 

 depths are obtained from the Accepted Depth 

 column of the A-sheet. Be sure that they 

 agree with their corresponding serial numbers, 

 line for line. 



14-135 r„°C.— The temperature of the 

 water, in degrees and hundredths Celsius, is 

 obtained from the Average T,„°C. column of 

 the A-shcct. Be sure that they agree with 



148 



H. O. 607 



