Carousel slide projector
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A carousel slide projector is a common form of slide projector, used to create slideshows.
A separate, circular tray holds several slides (usually 20, 36, 80, or 140) 35mm slides, and is filled with each slide placed in upside down and backwards, so that the image is presented with the correct orientation.
The projector body contains a stepper motor which rotates the tray. As the projector is advanced, a reciprocating mechanism pushes the currently loaded slide back out into the tray, then the tray is rotated, dropping the next slide into position between the light source and lens.
Simpler tray slide projectors often do not have the carousel form, but use the same mechanism with a linear tray.