1. How a movie projector works Movie By liam

2. CONTENTS 1 diagram 5 Moving pictures 2 diagram 6 records 1956 3 history Bibliography 4 picture

5. History Movies, short for moving pictures, have been around for more than a century. Movies work because of persistence of vision, the fact that a human eye retains an image for about one-twentieth of a second after seeing it. In the early 19th century, several devices began to appear that used persistence of vision to create the illusion of motion from still images. The zoetrope, invented by William George Horner in 1834, consisted of a series of pictures on a paper strip arranged on the inside of a revolving drum. The drum had small slits you could look through to see the pictures.

6. picturesThese pictures were typically of some repetitious movement, such as a person walking or dancing, because this movement could be looped easily. In a looped strip of images, the last picture in the series would almost match up to the first one, so that the images would create a single cycle of the simulated movement, which could be infinitely repeated to produce the illusion of continuing movement.

7. Moving picturesIn the case of a particular sort of zoetrope called the praxinoscope, there was a mirrored drum in the middle, so that you could see the pictures by looking through the top of the device. The pictures on the drum changed slightly from one to the next. By spinning the drum, you could make the pictures move fast enough to fool your eye into thinking it was looking at one moving picture. A movie projector is an opto-mechanical device for displaying motion picture film by projecting it onto a screen. Most of the optical and mechanical elements, except for the illumination and sound devices, are present in movie cameras

8. Recorders of 1956 Producer: Robert Edmonds Production Company: International Film Foundation Sponsor: Rob McGlynn Audio/Visual: sound, colour

9. Light source Incandescent lighting and even limelight were the first light sources used in film projection. In the early 1900s up until the late 1960s, carbon arc lamps were the source of light in almost all theaters in the world.The Xenon arc lamp was introduced in Germany in 1957 and in the US in 1963. After film platters became commonplace in the 1970s, Xenon lamps became the most common light source, as they could stay lit for extended periods of time, whereas a carbon rod used for a carbon arc could last for an hour at the most.Most lamp houses in a professional theatrical setting produce sufficient heat to burn the film should the film remain stationary for more than a fraction of a second. Because of this, care must be taken in inspecting a film so that it should not break in the gate and be damaged, particularly if it is inflammable cellulose nitrate film stock.

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