The final section of the world's tallest man-made self-supporting structure was placed in position on Monday (31 March) by a Sikorsky sky Crane helicopter in Toronto, Canada.
The final section of the world's tallest man-made self-supporting structure was placed in position on Monday (31 March) by a Sikorsky sky Crane helicopter in Toronto, Canada. The section competed the transmission mast of the New Canadian National Railways' Tower, which overlooked Lake Ontario.
The completed mast, which 335 feet (102 metres) high, gives the building its final height of 1,835 feat (559 metres), making it the world's tallest free-standing structure. Before its completion, the tallest structure was in the Soviet Union -- a tele-communications tower completed in 1967 at Ostankino in Greater Moscow. The Moscow tower is 1, 749 feet (533 metres) high.
The Toronto tower was begun in February 1973, as part of lake-front development of 190 acres (77 hectares). The development will take 15 years to complete, and is designed to give the Ontario capital a new commercial core, combining office and apartment accommodation.
Owned and built by the Canadian National Railways as its central communications and weather station, the tower will also serve the Canadian Broadcasting Corporation with six television transmitters and five radio transmitters.
This film is serviced with a commentary by reporter Chilton Chekov of the Canadian Broadcasting Corporation. A transcript is provided on page two.