[Interior, detail of air ducts.]

[Interior, view of air ducts.]

[Interior of unidentified building, possibly a factory.]

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

[Factory building, structure on roof.]

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

[Exhaust system on roof.]

325 East 79th Street. Penthouse garden, 17th floor.

17-19 West 17th Street. Loft building.

[Machine room.]

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

26-32 West 17th Street. Loft building.

[17-19 West 17th Street.]

[Interior, detail of meters.]

[Interior, boiler room.]

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

138-140 West 17th Street. Loft building.

Fourth Avenue and E. 17th Street. Everett Building.

12 East 86th Street. Croydon Hotel, 17th floor penthouse garden, Mrs. Zoylner.

Empire State Building, heating and ventilating equipment, main steam control room.