dinary circumstances in the scend in a spiral down the sides of the cone. At the with the fuel. The air for combustion comes as much atmosphere of the room, and, of course, is an element bottom of the cone a valve is placed, by which the ma- as possible from below and through the grate bars. of… … Fig. 1 also. The becoming well un- main pipes are derstood and ap- earried the length preciated that of the mill in lines corresponding generally with the with honest and intelligent management a good min- ply pipes as desired. In Fig. 4 this arrangement is long countershafts. These lines are…
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