460 



Ignition of Gases by Transient Arcs. 



of coal gas. Carbon monoxide is not so readily ignited as 

 hydrogen by continuous current break sparks, but it is little 

 behind it at atmospheric pressure. On the other hand, it is 

 much more difficult to ignite by impulsive sparks. The 



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practice of using low tension break sparks for the ignition of 

 large slow speed blast-furnace gas-engines is here justified 

 by the sensitiveness of this gas, largely carbon monoxide, to 

 ignition by such sparks. There is a marked difference when 

 alternating currents are used, coal gas is then ten times 

 easier to ignite than carbon monoxide, on account, probably, 

 of the greater mobility of the hydrogen ions. 



