After the county was surveyed by D.H. Kennedy, C. Cramer drew the map. Their work was done under the direction of Civil Engineer, Charles Ellet, Jr., and published in 1843, the same year that Ellet built the bridge over the Schuylkill River at Fairmount — the first large scale suspension bridge in the United States. The orientation of this map is to the northwest in order to fit the map onto four sheets. Blockley and Kingsessing townships, the core of West Philadelphia, are to the left.
Map of the County of Philadelphia, by Ellet
"A Map of the County of Philadelphia from Actual Survey Made Under the Direction of Charles Ellet, Jr., Civil Engineer, and in Accordance with the Act of Assembly passed June 30th, 1839"
Charles Ellet, Jr.