'Air Walker', Drury Lane Theatre, London, 1853.
© Science Museum / Science & Society Picture Library
Plate taken from the 'Illustrated London News'. This trick was performed by Mr Sands, the owner of the Hippodrome in New York. He used sandals attached by springs to platter-like soles, 0.3 metres in diameter to cros the platform from which he was suspended. Atmospheric presure of 101,325 pascals attached the air-walker to the platform laid acros the roof of the theatre, but this would have made it imposible for Sands to walk, unles, as the ILN suggested, he had used a hidden valve.