[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.]

[Exhaust system on roof.]

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

17-19 West 17th Street. Loft building.

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

26-32 West 17th Street. Loft building.

[Machine room.]

[Interior, boiler room.]

[17-19 West 17th Street.]

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

138-140 West 17th Street. Loft building.

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

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

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

[33 West 17th Street.]

[14 West 17th Street.]