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Figure 20. — "Sketch for a design of an Engine house and 

 Water office in the City of Philadelphia March 1 799." The ink 

 sketch is signed by B. H. Latrobe, architect. Engine, pump, 

 and boilers were located in the central rotunda. The surround- 

 ing spaces were designated (counterclockwise, starting at upper 

 left corner of Ground plan): "City Engineers office, Lobby. 

 Clerks, Portico, Engrs. Chamber, Coal Cellar, Steam-Engineer, 

 Portico." In Latrobe Collection; photo courtesy Maryland 

 Historical Society. 



41 



