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280 AMATEUR MOVIE MAKING
ture. Yet even there the new reversal process is not at a disadvantage, for duplicate positives can be made equally well from reversed film. The original is run through a printer in contact with fresh, unexposed film. The result is a negative, just as though the duplicate were being made from the original subject ; and, equally readily, the reversal process produces a positive. Thus amateurs can have two copies of a picture with the same amount of film that would be required for a negative and a print.
A hundred years since Daguerre !
The reversal process takes photography back to him in economy of material but a hundred years beyond him in effectiveness and inventive magic.
DuPONT POSITIVE-NEGATIVE FILM
By E. M. Tobias, Special Representative DuPont-Pathe Film Manufacturing Corporation
The sixteen millimeter amateur film now widely used by a majority of amateur cinematographers, was introduced on the market in the year 1924. The fact that the negative image made upon the film by exposure in the camera, was reversed by chemical treatment in the finishing process, to a positive image, cut down the cost of the film to a certain degree. By this process the same celluloid ribbon which was run through the camera formed the film for projection. This process was vastly different from that used with the professional (35 millimeter) film, which is a positive-negative process, as is the new DuPont-Pathe sixteen millimeter film. By positive-negative we mean that two ribbons of film are used for each picture. The ribbon which is run through the camera is developed as a negative, similar to the negatives secured from ordinary cameras. This film is then placed in contact with a second ribbon and run through a machine which exposes it to light and thus makes the positive film which is used for projection. This printing process is just like the printing process in ordinary still photography in which the positive is printed upon a piece of paper from a film negative, except that the print is made upon a second film.