The main function switch is marked Rewind, Off, Normal, and Wind. Off means that no power is reaching the circuitry. The motor will stop in a random position if it was running at the time it was switched to off. Normal is used for intervalometer and animation. It will run the same speed and stop in the same position each time.
Wind is used to forward the film more rapidly than normal for running off leader, etc.
This position can be used for continuous filming, bearing in mind that the speed, approximately 1.25 FPS, is not regulated and will vary with battery voltage, and that the camera will stop in a random position. Rewind moves the film in reverse, for backing up the film for double exposures, etc. It should not be used for filming since the Bolex uses a difference claw in reverse, which can cause unsteadiness and a displaced frame line. To rewind for a double exposure, cap the lens or close the variable shutter and back up the film a few frames more than wanted. Then go forward a few frames to the correct starting point, uncap the lens or open the shutter, and resume filming.