Prof. Oersted on the Compression of Gases. 107 



Table I. 



Experiments with a but-end having a valve lined with leather. 



Weight 



of the 



inclosed 



air, in 



grammes. 



Density, 

 that of 

 the at- 

 mosph. 

 =1. 



Pressure 

 on the 



valve, in 

 grammes. 



Pressure] height 



' 01 the 



divided 

 by the 

 density 



inclosed 



air. in 



grammes. 



Density, 

 that of 

 the at- 

 mosph. 

 = 1. 



Pressure 



on the 



valve, in 



grammes. 



Pressure 

 divided 

 by the 

 density. 



1-122 

 2'243 

 3-364 

 4-484 

 5-604 

 6-723 

 7*842 



812 

 1809 

 2552 

 3693 

 3495 

 5750 

 6693 



725 

 806 

 758 

 823 

 784 

 855 

 853 



8 

 9 

 10 

 10 

 10 

 10 

 10 



8-960 

 10-077 

 11-193 

 11-193 

 11-193 

 11-193 

 11-193 



6797 

 7711 

 8166 

 8434 

 8480 

 8445 

 8437 



758 

 764 

 729 

 753 

 757 

 754 

 753 



Table II. 



Experiments with a but-end, the valve of which was without 



leather. 



Weight 

 of the 



inclosed 

 air, in 



grammes. 



Density, 



that of 



the at- 



mospher. 



= 1- 



Pressure 



on the 



valve, in 



grammes. 



Pressure, 

 divided 

 by the 

 density. 



Weight 



of the 



inclosed 



air, in 



grammes. 



Density, 

 that of 

 the at- 



mospher. 

 =1. 



Pressure 



on the 



valve, in 



grammes. 



Pressure, 

 divided 

 by the 

 density. 



1 



1-122 



1269 



1131 



10 



11-193 



11440 



1022 



2 



2-243 



2368 



1055 



10-2 



11-417 



11725 



1027 



3 



3-364 



3388 



1007 



15 



16-76 



16766 



1000 



4 



4-484 



4751 



1059 



15-1 



16-87 



17243 



1022 



5 



5-604 



5750 



1026 



20 



22-326 



22988 



1029 



5 



5-604 



5620 



1002 



25-6 



28-543 



29253 



1025 



5-05 



5-657 



5790 



1023 



30 



33-393 



34197 



1024 



5-05 



5-657 



5800 



1025 



35-2 



39-13 



40232 



1026 



5 



5-604 



5790 



1022 



40-1 



44-52 



45633 



1025 



6 



6-732 



6871 



1021 



45 



49-894 



57641 



1035 



7 



7*842 



8113 



1034 



50 



55-362 



57467 



1038 



8 



8-960 



9344 



1043 



55 



60-816 



63102 



1037 



9 



10-077 



10375 



1029 



60 



66-254 



67798 



1023 



In the first table the mean number is 797, and we find that 

 the deviations from it are not regular. The mean of the se- 

 cond table is 1027 (by excluding the first number, the devia- 

 tion of which is too great), and we also find that most of the 

 numbers do not deviate far from it. However imperfect these 



O 2 experiments 



