, as used for electric furnace work, are of several kinds, some being made of graphite, others of carbon derived from the baking of coal tar pitch having a meltingpoint of from 150 degrees to 200 degrees F. A good pitch of this character loses nearly all its volatile matter at 6ooc F. Anthracite coal is one of the best materials for the making of amorphous carbon electiodes. The electrodes are formed by ramming the material into the mould, wherein it is calcined.
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