[Construction of the New York World's Fair site, showing the steel frame of the Perisphere.]

New York Worlds Fair. Perisphere and Trylon steel frame

[Construction of the Perisphere and Trylon, New York World's Fair site.]

[Construction of the Trylon and Perisphere, New York World's Fair site.]

[Construction of the Trylon and Perisphere at the New York World's Fair site.]

[Construction of the Trylon and Perisphere at the New York World's Fair site.]

[Construction of the Trylon and Perisphere, New York World's Fair site.]

[Construction of the Trylon and Perisphere, New York World's Fair site.]

[Construction of the Trylon and Perisphere at the New York World's Fair site.]

[Construction of the Trylon and Perisphere, New York World's Fair site.]

New York Worlds Fair. Perisphere and Trylon steel frame

[Construction of the Perisphere, New York World's Fair site.]

[New York World's Fair site under construction, with the frames of the Trylon and Perisphere in the background.]

[Construction of the Trylon and Perisphere at the New York World's Fair site.]

[New York World's Fair site under construction, with the frames of the Trylon and Perisphere in the background.]

[Construction of the Perisphere, New York World's Fair site.]

[Construction of the Perisphere, New York World's Fair site.]

[Construction of the Helicline, Trylon and Perisphere, New York World's Fair site.]

New York Worlds Fair. Perisphere and Trylon steel frame

[Construction of the Trylon and Perisphere, seen from the Administration building, New York World's Fair site.]