![](https://waterhistoryphl.org/wp-content/uploads/centre-square-basin-2018.002.0044-crop.jpg?w=300)
![](https://waterhistoryphl.org/wp-content/uploads/centre-square-basin-2018.002.0044-crop.jpg?w=300)
![](https://waterhistoryphl.org/wp-content/uploads/centre-square-29E858-04.jpg?w=300)
Centre Square Water Works, Frederick Graff, Sr. Plans, 1799
![Benjamin Henry Latrobe, portrait by Filippo Costaggini, 1880](https://waterhistoryphl.org/wp-content/uploads/Benjamin_Henry_Latrobe_by_Filippo_Costaggini.jpg?w=300)
Centre Square Water Works, Latrobe Plans, 1799
![Pen and ink drawing of the proposed Delaware Seventh Street Sewer](https://waterhistoryphl.org/wp-content/uploads/Sewer-Connection-1850-20050020525-200dpi.jpg?w=300)
Plan and profile of proposed Delaware Seventh St. Sewer, 1850
![1830 plan for the Pine Street Sewer](https://waterhistoryphl.org/wp-content/uploads/PineStreetSewer_20040920273.jpg?w=300)
Plan of Pine Street Sewer, 1830
![Bird's eye color view of reservoirs, green areas of foliage, pink roads and blue water, with a dam prominent](https://waterhistoryphl.org/wp-content/uploads/05_I6-2_1839_GRV17_750w.jpg?w=300)
Fairmount and vicinity, 1839
![Color drawing of an elevated water reservoir on the banks of a river with green land shown on either bank](https://waterhistoryphl.org/wp-content/uploads/Course05_Graff0557.jpg?w=300)
Isometrical View of Fairmount Water Works, 1843
![Frederick Graff’s drawing of the 1815 steam engine, adapted from a design by Englishmen Matthew Boulton and James Watt, shows the engine from the north, with Faire Mount and the reservoirs to the left of the drawing and the river to the right. The 1815 engine sat on the south side of the Engine House and was thus called the South Engine. As Graff indicated in his drawing, the Engine House was essentially open from river level to the roof in order to accommodate the massive beam and fly wheel of the two engines. While Graff showed the crank attached to the axle of the fly wheel, he left the crank shaft and the pump out of the drawing. The North Engine, designed and built in 1816 by Philadelphian Oliver Evans, advanced steam engines’ operating pressures from 2 pounds per square inch (psi) to 200 psi, a significant technological achievement.](https://waterhistoryphl.org/wp-content/uploads/Course05_Graff0419.jpg?w=300)
Steam engine drawing, Frederick Graff Sr., 1815
![](https://waterhistoryphl.org/wp-content/uploads/2008.001.0055_edit-pdf.jpg)
Color Diagram of Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia
![69th St. Sewer and Culvert across Lansdowne](https://waterhistoryphl.org/wp-content/uploads/17B-842-scaled.jpg?w=300)
69th St. Sewer and Culvert across Lansdowne AVe.
![Ventilating cover for manholes](https://waterhistoryphl.org/wp-content/uploads/17B-840.jpg?w=300)
Ventilating cover for manholes
![Sewage collection and disposal plan](https://waterhistoryphl.org/wp-content/uploads/2008.001.0055_edit-scaled.jpg?w=300)