[Interior, boiler room.]

[Interior with machinery.]

[Interior, boiler room.]

[Factory building, structure on roof.]

[Interior, detail of meters.]

[Interior, boiler room.]

East 58th Street. Street opening, wiping joint of lead pipe on street

[Interior, radiator manufacturing shop.]

[Exhaust system on roof.]

[Interior, boiler room.]

[Interior, possibly a basement, with unidentified equipment.]

[Machine room.]

29th Street pier. S.S. Mobile City ship, Isthmian Line. Sump pump pipes

60 Wall Street [70 Pine Street.] Cities Service Company. Interior, Riggs-Distler Heat units

[Heating control valve on 17th floor of unidentified building.]

[Brick wall cut-away with embedded drainage pipe.]

24 East 64th St. N.Y.C. View looking down into excavation for front wall

Centre Street and Pearl Street. U.S. Federal Courthouse. Interior, detail of roof showing lead installations

[Interior, view of air ducts.]

[Street excavation.]