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PREFACE
TH E optical principle of the moving picture machine is practically the same as that of the magic lantern, the only difference being that the pictures appear on a flexible transparent film, passing the lenses in rapid succession, in place of a glass lantern slide at rest.
The films which carry the successive pictures consist of a long transparent celluloid tape, containing a series of photographs taken at the rate of 15 to 25 feet per second A film 1,000 feet in length contains about 16,000 individual photographs, taken in 18 minutes. The movement of the object photographed has been recorded in such rapid succession that when the films are moved past the lenses in the projecting machine, at the rate at which they were taken, the change from one picture to another is made so rapidly that the eye cannot detect it, and it seems to present on the screen a single picture with all the movements of life.
Moving picture films represent the very highest branch of photographic art — that of bringing before the eye lifesize reproductions of life motion with all its accompanying effects of light, shade and expression.
This is a reproduction of film showing the exact width, the distance between the perforations, the size of the individual picture and the slow change in the position of the objects photographed.
All films are of standard gauge, followed by all manufacturers of films for the American market. The subjects are photographed on best celluloid film stock. All standard machines in use in pthis country accept these films.