A valuable report on smokeless coal combustion

“The Smokeless Combustion of Coal in Boiler Plants” is the title of a bulletin recently issued by the Technologic Branch of the United States Geological Survey. Various types of boiler settings and stokers are discussed in their relation to smokeless combustion of coal, and voluminous data are given as to the kind and character of the coal used. A concluding chapter gives valuable information regarding the operation of central heating plants. The bulletin may be obtained by writing the U. S. Geological Survey at Washington, D. C.