1878: Observatory of Instruction
View from southwest (photo circa 1886)

Princeton University. Property of the Trustees of Princeton University.
Source: Princeton University Archives, Mudd Library
View from Prospect Street

Other license.
Source: Don Oberdorfer, Princeton University: The First 250 Years, Princeton University Press, October 30, 1995
View from southeast (photo c.1878)

Princeton University. Property of the Trustees of Princeton University.
Source: Princeton University Archives, Mudd Library
View from southwest (photo 1880's)

Princeton University. Property of the Trustees of Princeton University.
Source: Princeton University Archives, Mudd Library
More information on Observatory of Instruction