Subjects Technology

Annual reports and other documents relating to Philadelphia’s water supply system, 1796-1992

Bird's eye color view of reservoirs, green areas of foliage, pink roads and blue water, with a dam prominent

Fairmount and vicinity, 1839

Drawing in blue ink on beige paper depicting reservoir, dam and standpipe heights

Diagram showing heights of reservoirs, dams, standpipes &c, 1894