320 BABCOCK. 



5. Callendar-Griffiths Equations for Resistance of Platinum 



as a Function of the Temperature 345 



6. Calibration of Standard Thermometer 346 



7. Calibration of Observing Thermometer 346 



8. Mass of Ammonia 347 



9. Volume of Ammonia Container 347 



V. Experimental Observations and Data 347 



1. Measurements of the Heat Capacity of the Apparatus 

 when filled with Ammonia, and Measurements of the 

 Heat Capacity of the Apparatus empty 347 



2. Ratio of Volt^box Coils 373 



3. Cahbration data for Standard Thermometer .... 373 



4. Calibration data for Observing Thermometer .... 38i) 



5. Mass of Ammonia 383 



6. Volume of Ammonia Container 385 



7. E. M. F. of Standard Cell 386 



8. Resistance of Standard Ohm 386 



9. Quality of Ammonia used 386 



10. Data on Method of filling Container with Ammonia . 386 



11. Data on Calorimetric Lag 387 



12. Data on Accuracy of Chronograph 388 



13. Data on Regulation of Constant Temperature Bath . 388 

 VI. Experimental Results 388 



1. Computed and Faired Values of Heat Capacity of Ap- 

 paratus filled with Ammonia and empty 388 



2. Specific Heat at Constant Specific Volume of Mixture 



of Liquid and Vapor 390 



VII. The Saturation Specific Heat of the Liquid and the Saturation 

 Specific Heat of the Vapor, in Terms of the Specific Heat at Con- 

 stant Specific Volume 392 



1. Derivation of Equations 392 



2. Keyes-Brownlee Data for Ammonia 394 



3. Computed values of the Saturation Specific Heats . . 398 



4. Comparison with Previous Work 400 



VIII. Critical Survey 402 



IX. Appendix 405 



1. Summary of Notation 405 



