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ELECTRIC LIGHT CARBONS

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International Tract and Missionary Society · Oakland, California · Feb 11, 1889

FromSigns of the Times, Vol. 15, No. 6.

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ELECTRIC LIGHT CARBONS.

Of 150,000 carbons burned daily in the electric lights used in the United States, 100,000 are manufactured in Cleveland, Ohio. Six years ago all the carbons burned in this country were made in a single room in Boston. Now there are 20 carbon furnaces in Cleveland alone. The carbons are made chiefly of the residuum of oil after it has been refined, and the deposit about natural-gas wells is also coming into use. The material is ground to a powder, a little pitch is added, and the substance is then placed in molds. These are packed in boxes and the latter placed in a furnace where they are subject to the most intense heat. The capacity of an ordinary furnace is 45,000 carbons.