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these centres are now generally known as film libraries.
Thus we have producers, renters and distributors, libraries, exhibitors and projectionists. As you are probably one of the last named, with the task of actually presenting the films which all the other people have handled, you may consider that your job is the most important of all. And whether you intend to exhibit hired films at home or to the public, do spare a thought for all the hundreds of people who have made the show possible. And look after both the film and the equipment which will use the film.
Persistence of Vision
All Moving Pictures owe their existence to an interesting and natural phenomenon known as the "persistence of vision/' and, as the majority of readers know, the whole of the film industry is actually founded on what is really an illusion. Illusion, because in actual fact there is no such thing as a moving picture in cinematography.
What the cinema patron sees is a series of "stills0 flashing onto the screen at the rate of twenty-four per second, but as the retina of the eye temporarily holds each flash of light he is not aware that there is any interruption in the apparently continuous light-beam directed at the screen. Each flash is of equal intensity, and as the impression on the retina fades, the succeeding flashes obliterate the fading impressions and yet continuously revive them. In other words, the eye holds each flash (and each "still" picture) until the next one cancels it out, and as each picture shows a development of movement in relation to the next, the observer is therefore under the impression that the picture actually moves.
The "persistence of vision' ' then, prevents us from seeing any separation between the rapid succession of "stills", and it is thus that we are able to enjoy the illusion of moving pictures.
The Meaning of Sub-Standard
The width of the cine film is usually measured in millimeters, and is often printed in an abbreviated form such as 16-mm. The length of a film is usually given in feet, with the exception, of course, to be found in those countries using the metric system.
The actual width of the films used in most cinemas is 35-mm., and the films and projectors using this size of film are known
16