The symbol and centerpiece of the 1939 New York World’s Fair was its combination trylon and perisphere. The trylon was a 610 foot tall tower, whose bottom section provided entrance for the adjoining 190 foot diameter perisphere.
This circa 1938 cutaway was drawn prior to completion of the trylon and perisphere. It shows how visitors would take escalators up through the trylon and be deposited on two “doughnut-shaped moving platforms,” as LIFE puts it, to watch a 6 minute show focusing on a futuristic, utopian City of Tomorrow.
Source: LIFE Aug 1, 1938
