Original old electrical vintage catalog for SPEER CARBON COMPANY in St. Marys, PA. Motor and generator brushes, carbon arc welding electrodes, graphite anodes, carbon products. There's one right brush grade for every motor and Speer makes it. Charts showing Alternating current slip rings and commutators, direct current voltage below 80 and 80 to 750, characteristics of grades. Disbound from a large 1944 engineering book, this one page unique technical data specification sheet would display beautifully matted and framed.
- SKU zc714
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