Vernon, Dai: Ambitious Card ©1949 Stars of Magic, Inc., NY Softcover, folded manuscript, 8.5x11", 4 pages

Image courtesy eBay seller OddClem1

Comments: Photographs by George Karger, edited by George Starke. Later part of the compilation book Stars of Magic, edited by George Starke.
Effect: A card is repeatedly placed into the center of a pack and caused to jump invisibly to the top or bottom. Whenever the spectator thinks he is following the magician's actions, he nevertheless finds that he has been completely bewildered.

Contents (from entry in Stars of Magic):

1 Effect
2 Instructions
3 The Double Lift
4 Note