14-195 Area. — Give the name of the area 

 under investigation; e. g. Nantucket Sound, 

 Raritan Bay, etc. 



14-196 Date. — Enter the day, month, and 

 3'ear. 



14-197 Time. — Enter the hour and minute 

 for the start of the station. Use local time and 

 indicate the time zone. 



14-198 Latitude and Longitude. — Record 

 the latitude and longitude in degrees, minutes, 

 and seconds. Indicate whether north or south, 

 east or west. Record at the start of the 

 station. 



14-199 Station Number. — A number shall 

 be used to designate each station. Start with 

 1 and number consecutively. Do not use 

 letter designations. Enter the number in the 

 space designated Station No. 



For those special stations that will be 

 occupied every day, week, or month, or at 

 any other series of regular intervals, assign a 

 number the first time the station is occupied 

 and retain that number. For all succeeding 

 regular observations, the number shall have a 

 letter suffix without an intervening hyphen, 

 i. e., lOA. If a special station in such a series 

 should be occupied by chance and not at the 

 regular established time, assign a new number 

 instead of adding a letter to the series. 



14-200 Observers. — Enter the name of the 

 oceanographic observer in this space. 



14-201 Depth.— Obtain the depth of the 

 water from the sonic sounder at the time of the 

 first Nansen bottle cast and enter it in the first 

 line of the Remarks column. Record the depth 

 in feet. 



14-202 THE LOG SHEET COLUMNS.— 

 The log sheet columns are completed in accord- 

 ance with the instructions given below. 



14-203 Serial Number. — The serial number 

 is composed of the station number followed by 

 a number indicating the depth of the Nansen 

 bottle or thermometer frame in feet. The 

 number shall be separated by a hyphen, i. e., 

 12-0, 12-3, etc. For the special stations, the 

 serial number is similar, i. e., llA-0, llA-6, 

 etc. 



14-204 Nansen Bottle Number. — Record in 

 this column the number of each Nansen bottle 

 or thermometer frame used during each cast. 



14-205 Wire Depth.— Enter the depths in 

 feet measured along the wire from the sea sur- 

 face to the depth of each bottle. 



14-206 Wire Angle. — Determine the angle 

 of the wire from the vertical immediately after 

 the messenger is dropped to trip the bottles or 

 frames. 



14-207 Therm. No. — The thermometer num- 

 ber is the manufacturer's serial number usually 

 found inside the reversing thermometer case 

 on the metal band supporting the main and 

 auxiliary thermometers. This number must be 

 recorded carefully as it is the only means of 

 identifying each thermometer. When reading 

 the thermometers, check carefully to ensure 

 that the thermometers on the Nansen bottle or 

 frames agree in number with those listed on the 

 log sheet. 



14-208 T. — The readings of the main ther- 

 mometers are recorded in degrees and hun- 

 dreths. 



14-209 t. — The readings of the auxiliary 

 thermometers are recorded in degrees and 

 tenths. 



14-210 t'. — Record the corrected readings of 

 the auxiliary thermometers. The corrections 

 applied to the readings (/) are obtained from the 

 thermometer calibration sheets. 



14-211 Vq. — The Fo is the volume of mercury 

 below the 0° C. mark at 0° C. in the reversed 

 main thermometer, expressed in degrees. This 

 value is obtained from the thermometer calibra- 

 tion sheets. 



14-212 L — The index correction for errors 

 in the main thermometer scale is obtained from 

 the thermometer calibration sheet. It is read 

 for the temperature of reversal, or as close 

 thereto as the table of calibration will permit. 



14-213 AT. — The correction for the thermal 

 expansion of the thermometer system after 

 reversal is computed from the formulas and 

 methods discussed in chapter 3. This value is 

 the same as C, as defined in chapter 3. 



14-214 Tc. — The corrected reading of the 

 protected reversing thermometer is obtained by 

 adding algebraically the values given in the T, 

 I, and A 7* columns. 



14-215 Sal. — The salinity of the water, in 

 parts per thousand, is obtained from the D- 

 sheet. 



14-216 o-t. — This, value gives, in abbre- 

 viated form, the density of the water samples at 

 atmospheric pressure. See sections 14-137 and 

 14-138 for more detailed instructions. 



14-217 Secchi Disc. — There are two col- 

 ums under this heading, one for black and one 

 for white Secchi Disc observations. Lower each 

 disc until it is barely visible, note the depth, 

 then lower until out of sight. Raise the disc 

 until it is again visible, and note the depths. 

 Record the mean of the two depths, in feet, in 

 the column for each disc. See chapter 12. 



14 218 Wind and Waves. — Record the data 

 for wind and waves using the codes given at 



154 



H. O. 607 



