The huge escalator linking this World with the Other, called "Operation Ethel" by the firm of engineers who constructed her under the aegis of the London Passenger Transport Board, took three months to make and cost 3,000 pounds (in 1946). "Ethel" had 106 steps each 20 feet wide and was driven by a 12 h.p. engine. The full shot was completed by hanging miniatures.
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