[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.]
26-32 West 17th Street. Loft building.
138-140 West 17th Street. Loft building.
[Brick wall cut-away with embedded drainage pipe.]
29th Street pier. S.S. Mobile City ship, Isthmian Line. Sump pump pipes
[17-19 West 17th Street.]
[Interior, detail of meters.]
90 Church Street. U.S. Federal Building and Post Office. Interior, 17th floor machine room
17th Street and 5th Avenue. Mott Iron Works Building.
Empire State Building, heating and ventilating equipment, main steam control room.