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6.1.2 Frequency of Calibration 17 



6.1.3 Bathythermograph Test Log and Repair History 17 



6.1.4 Uniformity Between Testing Stations 17 



6.1.5 Capacity of Testing Stations 17 



6.1.6 Hysteresis 17 



6.1.7 Rate of Response 17-18 



6.1.8 Reproducibility Tests 18 



6.1.9 Smoothness Tests 18 



6.1.10 Standardization of Testing Procedure 18 



7.0 ERRORS INTRODUCED BY OPERATING TECHNIQUES 19 



7.1 Errors Produced by Handling the Bathythermograph 19 



7.2 Errors Produced by Supplementary Equipment 19 



7.3 Errors Produced by the Operating Personnel 20 



8.0 ERRORS INTRODUCED BY PROCESSING OF BATHYTHERMOGRAPH DATA 21 



8.1 Temperature Correction Technique 21-22 



8.2 Depth Correction Technique 22 



8.3 Errors Involved in Correcting Techniques 22 



8.3.1 Poor Secondary Information 22-23 



8.3.2 Variation in Sets 23-24 



8.3.3 Factors Affecting Zero Depth of the Bathythermograph 24 



8.3.4 Reliability of Surface Bucket Samples 24-25 



9.0 PROPOSED METHODS FOR DISCOVERING, EVALUATING, AND 



MINIMIZING ERRORS IN THE EXISTING AND FUTURE BATHYTHERMO- 

 GRAPH DATA 26 



9.1 Establishing the reliability of the Surface Temperature Correction Techniques 26 



9.1.1 Use of Trend Charts 26-27 



9.1.2 Comparison of Standard Deviations 27 



9.1.3 Evaluation of Variability Data by the Coefficient of Correlation .... 27-28 



9.2 Use of Two Bathythermographs Simultaneously 29 



9.3 Other Techniques to Correct Bathythermograph Sets 29 



9.3.1 Correction of Bathythermograms through Heat Content Studies .... 29-30 



9.3.2 Curve Fitting Techniques 30 



9.3.3 Correcting the Bathythermograms by the Permanent Thermocline ... 31 



9.3.4 Use of Minimum Thermometer to Correct Bathythermographs 31 



9.4 Establishment of Average Bathythermograms 31-32 



9.5 Establishing Average Trends 32 



10.0 RECOMMENDATIONS 33 



10.1 Bathythermograph Instrument 33 



10.2 Calibration 33 



10.3 Operational Use of Bathythermograph 33 



10.4 Correcting Bathythermograph Traces 33 



10.5 Further Studies of the Errors of the Bathythermogrph 34 



10.5.1 Bathythermograph Sets 34 



10.5.2 Variation in Bathythermograph Sets 34 



10.5.3 Calibration Errors 34-35 



10.5.4 Reproducibility 35 



10.5.5 Operational Errors 35 



10.5.6 Other Methods to Correct Bathythermograph's Temperature 36 



11.0 GLOSSARY OF TERMS 37-46 



12.0 BIBLIOGRAPHY .47-50 



11 



