LOWRY. 



Phil. Mag. Ser. 6, Tol. 28, PL XI, 



(a) "Combined" gas 

 (J c.f.m.) parallel ar- 

 rangement (5 spark- 

 gaps and ozonizer). 



(b) " Combined " gas 

 (h c.f.m. ) reversed ar- 

 rangement (J spark- 

 gaps >- ozonizer). 



" Combined " gas 

 (§ c.f.m.) ordinary ar- 

 rangement (ozonizer 

 >- 3 spark-gaps). 



(</) 17 Spark-gaps 

 (.', c.f.m.). 



All tli e above gases I 

 were passed through 

 the trunk at a slow- 

 rate (.) c.f.m. instead 

 of 70 "c.f.m.) to give 

 time for the gases to 

 mature. 



