Page:Architectural Review and American Builders' Journal, Volume 1, 1869.djvu/687

 1869.] Descriptions. 555 A A A— Hot Air Flues. SECOND STORY. B B— Foul Air Shafts. PLAN OF SECOND STORY AND BASEMENT,— SHOWING THE SYSTEM OF VENTILATION,— IN THE MUNICIPAL HALL: PITTSBURGH, PA. By Lewis W. Leeds.