034 Prof. Townsend and Mr. Kirkby on Conductivity produced 



Table II. — Currents in Hydrogen. 

 Plates 5*5 millims. apart. 







Pressures. 





X. 



















4- 7 



177 



•84 



•356 



69 



7 



5-43 







138 



8-2 



9-1 



9-2 



64 



207 



11 



155 



126 





276 



18 



25-5 



172 





345 



32-5 



40-5 



20-8 





415 



68 



66-5 



25-5 



11-2 



484 



153 



119 



31-6 



11-2 



553 



490 





40 



11:2 





5. 



6. 



7. 



8. 



The following experiments were made with the plates 

 farther apart in order to obtain experimental results in 

 support of equation (1) (section 3) : — 



Table III. — Currents in Hydrogen. 

 Plates 103 millims. apart. 



X. 



Pressures. 



14-5 



9 5 



4-7 



37 

 185 

 221 

 295 

 332 

 369 

 406 

 435 

 464 

 493 



131 



15*1 



201 

 29-8 



247 

 27 5 



42 



78-5 

 119 

 194 

 325 

 670 



125 



325 

 109 



280 



At pressures of about 30 millimetres the presence of new 

 ions in hydrogen can easily be detected by a potential-differ- 

 ence of 500 volts between the electrodes 5 millimetres apart. 

 With carbonic acid gas at 30 millimetres pressure, a much 

 higher voltage would be necessary to obtain an appreciable 

 number of new ions. 



With plates 5 millimetres apart very large conductivities 

 can be obtained at a pressure of about 4 millimetres. In 

 some cases the conductivities were so great that they could 

 not conveniently be measured by a sensitive electrometer. 



