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.

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

[Factory building, machinery on roof.]

Woolworth Building, swimming tank.

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

Gas fired heating system in the Winchell residence, Fieldstone.

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

[Factory building, structure on roof.]

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

[Roof of building.]

Woolworth Building. Swimming tank.

129 Amsterdam Avenue. Raisler Heating Building.

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

National Lead Company. View of lead flashing on roof

View of lead flashing on roof of National Lead Co.

Woolworth Building. Looking up at tower on roof.

Woolworth Building. Looking N.E. toward Municipal Building on roof.

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