1991.064.336
Print, Photographic
Black and white photographic print mounted on fabric depicting mills at the Champion Spark Plug Co.
Caption reads: Photograph 4
Pulverizing the crushed material. The conical mill in the upper left is filled with steel balls and does the preliminary grinding. The material then passes over magnetic separators (shown in the center of the picture) and over into the second conical mill at the right, which is filled with porcelain balls, and where the final pulverizing of the product is accomplished.
