Using formula number (2), compute Cp and enter in block Cp. 

 LEFT THERMOMETER ^ ^ (16.92-18.4)(16.92 + 101.0) _ ^^^ 



Therm No. 510-64 ' 6100-100 



RIGHT THERMOMETER 



Therm No. 157-64 """ 6100-100 



^ _ (16.81-18.3) (16.81 + 103.7) _ ^^^ 



Step 4. Add T', I, and Cp algebraically to obtain corrected protected thermometer reading T„. 

 Therm. No. 510-64: 



(1) T' + I + Cp=Tw=16.92 + (-.05) + (-.03) = 16.84° 



(2) T'+I+Cp=T„=16.91 + (-.05) + (-.03) = 16.83° 



Therm. No. 157-64: 



(1) T' + I + Cp = Tw=16.81 + ( + .02) + (-.03) = 16.80° ( 



(2) T' + I + Cp=Tw=16.82+( + .G2) + (-.03) = 16.81° 



Step 5. Repeat steps 1 through 4 for each protected thermometer on the Nansen bottle, 

 and average the T„'s to obtain the accepted or average water temperature. Enter in Accepted or 

 Average T^ block. NOTE: If the T^'s of paired thermometers differ by more than +.06°, defer 

 the calculation of the average Tw because one or the other or both T„'s are not \vithin the range of 

 acceptabiUty. f 



Average Tw= 16. 82° 



Step 6. After the average T„ for a Nansen bottle observation has been determined, compute 

 Cu (correction for unprotected thermometers) by the formula: 



(1) g_^_(Tw-t„)(T„'+Vo) < 



(2) a= 



K-|(T„-t„) 



(Tw-tu)(T/+Vo) 



K 



Where 2(T„— tu) is rounded off to zero. 



Where T^ is the average from step 5 above, tu is the corrected unprotected auxiliary thermometer 

 reading, Tu' is the unprotected main thermometer reading, and K is rounded to 6100. 

 Using formula (2), compute Cu and enter in C^ block. 



RIGHT THERMOMETER ^ (16.82- 18.5) (20.96- 120.8) ..^ 



Therm. No. 419-63 "~ 6100 " 



Step 7. Add Tu', I, and Cu algebraically to obtain corrected unprotected thermometer reading 



Therm. No. 419-63: 



(1) and (2) Tu' + I + C=Tu=20.96+(-.01) + (-.04)=20.9r 

 Transfer Tu to Accepted or Average T^, column and enter 'Tu above the value. 



F-5 Thermometric Calculations. — Thermometric calculations (fig. F-5) are performed to determine 

 the depth at which Nansen bottles equipped with unprotected thermometers were reversed. 



Step 1. Enter the "Q" factor from the calibration record (fig. F-3) in the "Q" Factor block. 

 If wire depth (L) is less than 1,000 meters, and "Q" factor is not available for 500 meters, use "Q" 

 factor for 1,000 meters. Use the value nearest to the wire depth (Z) or estimated accepted depth. Inter- 

 polation between "Q" factors usually is not performed. 



"Q" factor for Therm. No. 419-63 is .0081841 at 1,000 meters. 

 Step 2. Compute Tu-T^ difference. 

 20.91°-16.82° = 4.09° 



F-6 



