Movie projector
A movie projector is a machine that shows moving pictures by projecting them on a projection screen. Most of the optical and mechanical elements, except for the illumination and sound devices, are present in movie cameras. Many movie projectors use film and are called "film projectors". They are similar to slide projectors but with additional parts to keep the film moving at the correct speed.
Movie Projector Media
35 mm movie projector in operation
Bill Hammack explains how a film projector works.
Simulation of a spinning zoopraxiscope
An early projector and seats from a movie theater
1910's 35mm hand-cranked tinplate toy movie projector manufactured by Leonhard Müller in Nuremberg, Germany.
Mechanical sequence when image is shown twice and then advanced.*Outer sprockets rotate continuously while the frame advance sprockets are controlled by the mechanism shown – a Geneva drive. 
Imaging lens Diastar of an Askania 35 mm movie projector (focal length: 400 mm)
Christie AW3 platter, BIG SKY Industries console, and Century SA projector
nonrewind in Royal – Malmö, Sweden
