Typed on back: "Source: Enjine! Enjine! by Kenneth Holcombe Dunshee A Story of Fire Protection published by Harold V. Smith for the Home Insurance Fire Company New York 1939 (Wilmington Institute Free Library) Page 39: No. 3 Cast Iron--Fire...
"Philadelphia Savings Fund Building; Chilled Water Inlet and Outlet from Circulating Pumps to 20th Floor, Top Pipe Cool Water Return from Cooling Tower to Carrier Units Condenser"
On Back: "Sketch supplied by Hyman Myers - Vincent Kling and Associates; Branch Bank & Office Building for the Philadelphia Saving Fund Society, 12th and Market Streets; H. Berkeley Hackett Mechanical Engineer, George A. Fuller Company General...