nd the contained in and by the combustion chamber ; suitable open- brown color of the rough marble exposed. Powdered white upper edge, as shown. ings being left for extracting the residue. The air or gas for The inner bowl is made of one kind of material, or it may lead is sometimes rubbed into the… … marble worked in this country, namely, that of the Mosquito slab or tile of refractory materials amongst the fuel, and the Valley, near Williamsport, Pa.,which is a very compact,excel- It will be seen that when the outer and unner bowls are- heated products of combustion, after heating the parts to…
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