lot of three matching c. 1920's american three-legged cast iron baked black enameled science laboratory support stand bases designed and fabricated by or for the central scientific company, chicago, il. the weighted science apparatus tripod stands contain centrally located threaded holes for supporting long solid steel support rods. the iron bases were salvaged from the old cook county radiology department. the original black enameled finish remains largely intact. priced for the lot of three.