Présentation de l'éditeur
OtETER INTRODUCTION According to latest, estimates (1920), almost a billion dollars worth of coal is wasted every year in the United States due to inefficient corabusion of fuels under steam boilers. The average boiler efficiency is around 50 and could be easily raised to around 70; if the biggest loss due to imperfect combusion could bee liminated. The problem then resolves itself into finding a method for determining the proper proportioning of air and fuel in the furnace. This method must be simple enough for the fireman to follow, and the more independent the device used, as a guide is of local conditions the more its practicability. Now, if the temperature of the furnace, or rather of the gases leaving the furnace, be studied, it will be found that the closer the amount of air used for combustion is to theoretical requirements the higher will the furnace temperature be.
(Typographical errors above are due to OCR software and don't occur in the book.)
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