The Philippine Journal of Science 



not to smother the fire. See that the gas purge valve near the 

 exhaust of the engine is open to the atmosphere. Test the gas 

 in the burner connected to the three-way cock ; if it is ignited, 

 stop the blower, turn the four-way cock to admit air directly 

 from the atmosphere, and put the three-way cock in the gas flue 

 in position to discharge gas into the delivery pipe. Never stand 

 directly in front of the air intake of the producer, as back firing 



