vm 



CONTENTS 



THIRD SERIES OF DETERMINATIONS. 



ii- — Third Method 



34. —Filling the Globes with Oxygen 



35. — Sources of Oxygen 



36. — Measurement of Pressure 



37. — VVeigliing the Globes 



38. — Weight of Globes when Exhausted 



39. — Observations and Results 



40. — Final Result for the Density of Oxygen 



I 

 2 



3 

 4 

 5 

 6 



7 

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9 



ID, 

 II 



PART II.— ON THE nFNSITY OF HYDROGEN 



— Introduction ...... 



— Determination of Density by First Method 



— Preparation of Hydrogen 



— Proof of the Purity of the Hydrogen 



— Observations and Results 



— Second Method .... 



— Preparation of Hydrogen 

 — Filling Globes with Hydrogen 

 . — Measurement of Pressure 

 . — Observations and Results 



■Remark on the Results of the First and Second Series 



NEW METHOD OF DETERMINING THE DENSITY OF HYDROGEN. 

 12. — Introduction ........ 



13. — Apparatus for Measurement of Volumes 



14. — Capacity of Connecting Tubes .... 



15. — Exhaustion of Globes ...... 



16. — Manipulation of Tube Containing Palladium 



17. — Hydrostatic Weighing of Tube Containing Palladium 



18. — Weighing the Tube Containing Palladium 



19. — Introduction of Hydrogen into the Globes . 



20. — Measurement of Pressure 



21. — Second Weighing of the Palladium 



22.— Verification of Accuracy of Weights 



23. — Reduction of Observations . 



24. — Observations and Results 



25. — Sources of Error . 



NEW METHOD AND SECOND APPARATUS 



26. — Reason for Constructing a Second Apparatus 



27. — Capacity of Globes 



28. — Connection of Globes to Pump and Barometer 



29. — Capacity of Connecting Tubes 



30. — Remainder of the Process 



31. — Remarks ...... 



32. — Observations and Results 



33.— Final Result for the Density of Hydrogen 



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