[Interior, boiler room.]
[Interior, detail of meters.]
East 58th Street. Street opening, wiping joint of lead pipe on street
[Machine room.]
[Interior, radiator manufacturing shop.]
[Exhaust system on roof.]
[Brick wall cut-away with embedded drainage pipe.]
[Heating control valve on 17th floor of unidentified building.]
[Interior with machinery.]
[Excavation of an unidentified street.]
[Factory building, structure on roof.]
[Street excavation.]
[Interior, detail of air ducts.]
[Sixth Avenue El and street excavation.]
[Interior, possibly a basement, with unidentified equipment.]