356 



Messrs. Trowbridge and Richards on the Temperature 



and over the same two driers as the hydrogen. The length 

 of the spark-gap remained always the same, excepting for the 

 very lowest and the very highest pressures of gas, through 

 which the electricity refused to pass unless the spark-gap 

 was narrowed. 



In the first column of each table below is recorded the 

 tensions of gas, in the second, third, and fourth are recorded 

 the numbers of half-oscillations obtained with the three 

 different capacities respectively, while in the fifth, sixth, and 

 seventh of these columns are to be found the resistances 

 corresponding to these oscillations, each value being taken 

 from its proper curve in fig. 2. In order to give a better 

 idea of the comparison and the way in which the oscillations 

 are damped, reproductions from two photographs are appended 

 (p. 360). 



The Resistance of Hydrogen. 





Number of half-oscillations. 



Resistance in ohms. 



Pressure 

 of gas. 





























Capacity 



Capacity 



Capacity 



Capacity 



Capacity 



Capacity 





= 6000. 



= 12,000. 



= 18,000. 



=--6000. 



= 12,000. 



= 18,000. 



millim. 









(ohms.) 



(ohms.) 



(ohms.) 



13-5 













over 100 





100 



2| 





2 



50? 





15 



50 



1 



2* 



2 



30 



20 



15 



3-6 





2 







20 





30 





3 



3" 





15 



10 



20 



2 



3 



3 



20 



15 



10 



1-8 





3 







15 





1-25 



3* 



3 



4* 



15 



15 



7 



115 





4 







10 





085 





H 







9 





0-75 





H 







5-5 





0-60 





7 



e" 





5 



5' 



0-40 





6 







6 





0-31 



H 



7 



6" 



7" 



5 



5" 



021 





6 





... 



6 





0-15 



5 



5£(?) 



6+ 



10 





5 



010 











"7 





0-05 



H 



no spark. 



110 spark. 



i'i 







