that is, furnaces in dation until the temperature is which the heat is reverberated raised considerably. It is often or thrown down from the raised as high as 16000 F. arched roof of the furnace before the oxidation is com- upon the material which is to be treated. The hearth or plete. While the… … that time, with the tempera- The molten lead is constantly stirred
Paint · Varnish
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