[Exhaust system on roof.]
[Factory building, machinery on roof.]
[Factory building.]
[Interior of unidentified building, possibly a factory.]
[Heating control valve on 17th floor of unidentified building.]
[Interior with machinery.]
[Interior, boiler room.]
Apartment building. Penthouse roof terrace
National Lead Company. View of lead flashing on roof
Interior, shoe factory with man at machine
[Roof of building.]
Interior, shoe factory with woman at machine
Woolworth Building, Under No. 3 Barclay [Construction zone.]