Show Dust Coal Firing i Fine coal dust or dust of ot flour I mixed with air all forms an lin explosive agent ent which has been the thc caus cause of ot many a n mine and ond mill flour disaster Advantage I Is taken of ot this property of at combustible dust In a process of ot boiler boller The fuel reduced to dust Is fed b by machinery Into the furnace In 10 which a fire lire must constantly be bo maintained The Time Instant the dust falls tails into the furnace chamber It burns with witha a flash almost explosively and the production of smoke Is absolutely pre- pre vented and the firing tiring becomes economical economical econom econom- ical as regards consumption of fuel It would seem that it might lead to time the utilization of or the enormous mountains moun moun- mountains of coal slack which cover so soman man many square miles of or land in the mining min ing districts |