In the molten slag viscometer, the inert gas supply pipe which is located on the outer circumferential surface of the carbon measuring cup and is in close contact with the inner wall of the tube and extends to the lower part of the carbon measuring cup, and a reflecting mirror attached to the lower part of the cooling means, A molten slag viscometer further includes an indicator needle attached to a lower portion of the cooling means, and an electric furnace having a reference point corresponding to the indicator needle on an upper portion thereof.
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