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The effect of adding graphite to mixtures of refractory powders volatilized in the crater of a carbon arc has been studied for various proportions of graphite. In general the lines of the less volatile elements, Al, Mg, Si, and Ti, are amplified. This may be due to the reduction of
the refractory oxides by the graphite, and also to the inhibition by the graphite of globule formation in the crater, resulting in more rapid volatilization of the powder.
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