A 1946 Popular Mechanics magazine item shows how
an illusion can easily be created "in-camera."(Click to enlarge)
The text of the short article:
Trick Photos of Girl Tennis Player Give
Illusion of Action
By planning the "action" in advance a photographer can give the illusion of movement in still pictures. For a photo of a girl tennis player smashing at a drive, Dale Britton, of Albuquerque, N. Mex., needed an assistant, a fishing pole and a length of string. He tied the ball to the fishing pole and his assistant dangled it into the picture area while the girl leaped into the air and swung her racket as if she had hit it.
Popular Mechanics, Oct 1946, Google Books>>