Legendary stage magician Joseph Dunninger demonstrates some of the tricks employed by fake mediums in the first five minutes of this rare 1937 Pathé News video recording. Like his contemporary Houdini, Dunninger pre-empted James Randi by offering a $10,000 prize to any psychic who could demonstrate powers that he could not explain by normal means. And like Houdini and Randi, he used this challenge to his advantage as a method of publicity.
(via @Daniel_Loxton)
