Distribution Department, Low Service Pipe Lines, interior of 48-inch insulation joint No. 6, after 4 years and 2 months service at Middlesex Avenue, showing tubercles with electrolytic pits beneath, Medford, Mass., Mar. 24, 1909

Distribution Department, Low Service Pipe Lines, interior of 48-inch insulation joint No. 6, after 4 years and 2 months service at Middlesex Avenue, showing tubercles with electrolytic pits beneath, Medford, Mass., Mar. 24, 1909

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