Phil. Mag. Ser. 6. Vol. 28, PL XIII. 



JOULES 

 002. 



18 



12 



•00 IO 



8 

 6 

 4 

 2 

























\\ 





















\\ 



































































\ 



\ 





















\ 



.ENERGY 



















\ 













CAP/ 



\crr 



































M. FARADS 

 2-0 



1-8 



1-6 

 1-4- 

 12. 

 10 



•8 



•6 

 •A- 

 1 



2.o 40 6o 80 100 120 I^O IfcO l&O 200 



VOLTS 



Fig. 7. — Ignition of hydrogen by condenser discharge. 

 Platinum poles. 30 per cent, of gas in air. 



1^ IG , 8. — Ignition of coal-gas by condenser discharge. 

 Platinum poles. 11 per cent, of gas in air. 



