Gases at Reduced Pressures by Transient Arcs. 453 



•8 AMPERES. C.C. 2. 



■7 



•6 1 FIG. I. -I 



HYDROGEN 

 •5 



4 



■3 



•2 



2 4- 6 8 \'0 V% 1-4- O -2 -4- e -8 l-O 12. t 4- 



2 20 







































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r 1 



HYDt 



G.|. 



=lOGE 



N 









/ 



K 











11/ 



\ 



I 









j / 



\ ' ' 





\ 



L 



















y 













\ 































K 





r I s>. ^. ■ ■ i 

 METHANE 





\ 









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i 

































1 













1 

 I 







' 



) 













15 













p 











1 



ft 





PR 



OPANE 

 1 



10 





















\ 













•5 





1 



\1 

















V 













i 











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Z H 



4. Relative Influence of Carbon and Hydrogen Atoms on 

 the Ignition of Paraffins. 



A curve similar to fig. 5 has been obtained for the same 

 gases ignited by incandescent wires *. The presence of a 

 carbon atom increases affinity for oxygen, methane having a 

 stronger affinity than hydrogen for oxygon as shown by 

 analysis of the products of combustion at high pressures. 



* "The Ignition of Gases by Hot Wires," Phil. Mag. vol. xxxviii. 

 November 1919, fig. 3. 



