[Interior with machinery.]

[Interior, radiator manufacturing shop.]

[Interior, detail of air ducts.]

[Machine room.]

[Interior, boiler room.]

[Interior, boiler room.]

[Interior, boiler room.]

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

[Interior, boiler room.]

[Interior, view of air ducts.]

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

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

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

[Interior of unidentified building, possibly a factory.]

Meter Service Corporation. Electric meters, covered

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

[Factory building, structure on roof.]

[Exhaust system on roof.]