18 



rV . EQUIPMENT CALIBRATION 



A. TEMPERATURE MEASUREMENT 



In order to measure the therrnostatic bath temperature to 0.005°C, 

 a copper -constantan thermocouple was constructed. The emf s produced were 

 measured with a Leeds & Northrup Model K-2 potentiometer, and the corre- 

 sponding temperatures read from graphs that have been prepared . 



Measurements comparing the temperature of the hydraulic fluid in- 

 side of the cavity of the pressure vessel with the temperature of the surrounding 

 oil of the thermostatic bath were made. The results, given in Table I, show that, 

 within the limits of experimental error, the temperature of the conductivity cell 

 immersed in the hydraulic fluid inside the pressure vessel is the same as the bath 

 temperature . Measurements were also made at and 5°C. Within the deviation 

 of the measurement, bath and cavity were at the same temperature. The tem- 

 perature deviations within the bomb were significantly less than those in the bath, 

 due to the thermal inertia of the massive pressure vessel. Measurements dis- 

 closed small (less than 0.5°C) temperature differences between the bottom and 

 surface of the bath at different distances from the heating and cooling elements . 





TABLE I 





COMPARISON OF TEMPERATURE IN CAVITY AND BATH 



Number of 

 Measurements 



(°C) 

 In Bath 



In Cavity 



1st day 



6 



6 



10 



8 



24.533 ±0.019 

 24. 170 ±0.050 



24.453 ±0.026 

 24.385 



24.405 ±0.001 





24.405 (AT =+0.020°C) 



2nd day 

 6 

 7 

 5 



24.755 ±0.001 



24.780±0.001 

 24.767 



24.768 ±0.011 





24.768 (AT =+0.001°C) 



3rd day 



10 



8 



5 



24.787 + 0.004 



24.790 ±0.000 

 24.789 



24.790 ±0.000 





24.790 (AT =+0.001°C) 



1 

 1 



1 



52.80 

 54.96 



57.78 



53.75 (AT=+0.95°C) 

 54.10 (AT = -0.86°C) 

 57.78 (AT= 0.00°C) 



;artbur B.lL\nU3nt. 



s-700 1-0307 



