late 1940's american medical heavy gauge stainless steel adjustable height swivel stool salvaged from the old cook county hospital located in chicago, il. the robust tubular steel four-legged base contains outswept feet and a welded joint concentric ring, providing added support and stability. the swivel seat with slightly sunken center is tightly affixed to a long solid threaded steel rod or post attached to the base. the seat is adjusted (in height) by rotating clockwise or counterclockwise until desired height is reached. believed to have been fabricated by the a.s. aloe company, st. louis, mo.