Abstract: A circular magazine for photographic slides is provided with a circular segment slider 15 rotatable about the magazine axis to extend a tongue portion 18 over the slide insertion slot 17 in the magazine base plate 14, to thereby close the slot and prevent slides from falling out when the magazine is removed from the projector. Upon insertion in the projector a central hub 24 is rotated whereby its cam surface 25 engages follower 28 on lever 22 to rotate the latter about pivot axis 21. Stop 23 on the end of the lever bears against pin 19' on the segment slider and rotates the latter to open the slot window 17.

Abstract: The device is provided with a lever which is pivotally mounted at one end and is urged in the downward direction by a spring, a slide-carrying shoe being attached at the free end of the lever. The lever has an upwardly curving centre portion which rests on a roller mounted on a disc driven at half-speed by a motor. The device also comprises a slide guide consisting of two prismatic rails, one of which is stationary, while the other is secured to a carriage mounted displaceably in the plane of the slide and capable of being pulled towards the stationary rail by means of a spring. There is a coupling pin on the carriage which is engaged with a control cam provided on the lever-driving disc, the said cam being designed in a manner such that the movable prismatic rail is pulled back only during the downward movement of the slide shoe which moves between the prismatic rails, the said slide being otherwise pressed against the stationary rail under the action of the spring.