[Interior, boiler room.]
[Interior, detail of meters.]
29th Street pier. S.S. Mobile City ship, Isthmian Line. Sump pump pipes
[Interior with machinery.]
[Interior, radiator manufacturing shop.]
[Brick wall cut-away with embedded drainage pipe.]
[Interior, possibly a basement, with unidentified equipment.]
[Exhaust system on roof.]
[Interior, detail of air ducts.]
[Interior, view of air ducts.]
[Detail, machine.]
Small addressing machine
Machine set up
Furnace and boiler room
Interior, machine shop
[Heating control valve on 17th floor of unidentified building.]