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 etched surface, to increase combustion passes from the chamber through the perforated be lined with any suitable material,as… … 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 inner bowls are heated products of combustion, after heating the parts to be lent material, but until very lately every effort to…
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![An illustration from [Catalog]. (1908)](https://img.insideoutlibrary.com/img/200/ia-catalog00macy-158-427.webp)
