Figure F-4. Portion of an A-Sheet showing reversing thermometer corrections. 



F-4 Correcting the Reversing Thermometer. — To correct reversing thermometers, the follow- 

 ing calculations are made on the A-Sheet : 



Step 1. From the calibration records (fig. F-3) for the thermometers used on Nansen bottle 

 No. 11 (fig. F^) , enter the Vo in the Vo block. 



Therm. No. 510-64 Vo is 101.0° 

 157-64 103.7° 



419-63 120.8° 



Step 2. Find the main and auxiliary thermometer corrections in the interpolation table of the 

 calibration records (fig. F-3) ; enter the main correction in the /block; enter the corrected auxiliary 

 value above the recorded value in Aux. (t) block (if correction is zero mark a line above the recorded 

 value) . 



Therm. No. 510-64: Main temperature readings 16.92° and 16.91° fall between 16.40° and 



20.00° in the interpolation table with a correction value —.05. Enter 



— .05 in block /. 

 Auxiliary temperature readings 18.4° and 18.6° fall between 1.7° and 



50.0° in the interpolation table mth a correction value of zero. Indicate 



by dra\ving a line over 18.4 and 18.6. 

 Therm. No. 157-64: Main temperature readings 16.81° and 16.82° fall between 12.62° and 



20.00° in the interpolation table mth a correction value of +.02. Enter 



+ .02 in block /. 



Auxiliary temperature readings 18.4° and 18.5° fall between 6.2° and 



40.5° in the interpolation table \nth a correction value of —.1. Write 



18.3 over 18.4 and 18.4 over 18.5 in Atix. (t) block. 

 Therm. No. 419-63: Main temperature readings 20.96° fall between 17.50° and 22.25° in the 



interpolation table with a correction value of —.01. Enter —.01 in 



block /. 



Auxiliary temperature readings 18.5° and 18.6° fall between 17.6° 



and 31.5° in the interpolation table with a correction value of zero. 



Indicate by drawing a line over 18.5 and 18.6. 



Step 3. Compute Cp (correction for protected thermometers) by the formula: 



(T'-t)(T'+V„) 



(1) C, 



(2) Cp= 



K-|(T'-t)-(T'+Vo) 



(T^-t)(T'+Vo) 

 K-lOO 



Where A(T'-t)-(T'+Vo) is rounded off to 100. 



Where T' is the main thermometer reading, t is the corrected auxiliary thermometer reading, 

 and K (6098) is the "K" value from the cahbration record rounded to 6100. NOTE: Most ocean- 

 ographers prefer to calculate thermometer corrections \vith a special oceanographic slide rule (see 

 par. F-10) and to check the computation \nth a calculator. 



F-5 



