[Interior with machinery.]

[Interior, detail of air ducts.]

[Interior, radiator manufacturing shop.]

[Machine room.]

[Interior, boiler room.]

[Interior, boiler room.]

50th Street and 11th Avenue. Horn and Hardart Bakery, pressure meter, cast iron type.

[Interior, view of air ducts.]

[Interior, boiler room.]

[Interior, possibly a basement, with unidentified equipment.]

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

[Interior, boiler room.]

[Equipment detail, New York World's Fair.]

Meter Service Corporation. Electric meters, uncovered

Manhattan College. Interior, boiler room

Centre Street and Pearl Street. U.S. Federal Courthouse. Interior, detail of roof showing lead installations

[Interior of unidentified building, possibly a factory.]

[Factory building, structure on roof.]

533 West 57th Street. Pavelle Laboratories. Interior, photo lab. Construction view

[Heating control valve on 17th floor of unidentified building.]