to an an- nealing temperature. In practice it is found necessary to keep the elec- trodes cool by keeping water circulat- ing in or around them. In order to prevent the plate cooling too rapidly after it has reached the proper tem- perature, the current is diminished very slowly, since the heat… … each opening. The kiln holds about 70 barrels of charcoal. The top of the kiln is bricked over with the exception of a circular opening about 214 feet in dia- barbette plates of the Massachusetts, and the results meter in the center. ders are perforated with holes about ¥% of an inch in After…
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