View of row of valves against wall in penthouse, Main Library, Detroit Public Library during construction. Openings in floor with ladders provide access to penthouse. Handwritten on front: "S118, S27." Printed on front: "Detroit Library Commission. Addns & alterations to Main Public Library. Bryant & Detwiler Company, contr. Descr. So. Wing penthouse. No. 41. Date: 4-20-61. Win Brunner, photo."
