View of heating system for water tanks on roof of building, inside.

[Exhaust system on roof.]

New York Telephone and Telegraph Building, view of statue on roof.

[Factory building, machinery on roof.]

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

Woolworth Building, swimming tank.

[Roof of building.]

Gas fired heating system in the Winchell residence, Fieldstone.

Woolworth Building, basement room over swimming tank, view from entrance.

[View from roof of unidentified building, Empire State Building in distance.]

Woolworth Building. Swimming tank.

[Factory building, structure on roof.]

View from Woolworth Building roof looking at S.W. corner of building.

129 Amsterdam Avenue. Raisler Heating Building.

View of lead flashing on roof of National Lead Co.

National Lead Company. View of lead flashing on roof

Metropolitan Building, view looking north along roof-houses, etc.

Woolworth Building. Looking up at tower on roof.

Sewage disposal plant, birds-eye view of disintegrating tanks, looking N.W. at open tanks.

Consolidated Gas Co. Building, East 15th Street. Front view of switchboard booster system.