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of cameras as small and compact as possible, so that an ama- teur motion picture camera is little more than the very small and compact cameras used for still photography. COMMERCIAL PROCESSING AUTOMATIC— The process- ing is done on automatic machines consisting of a number of tanks which carry racks with rollers, by means of which the film is fed continuously through the solutions. The machines are entirely automatic, the films being fed in as they come from the customer and taken out of the drying cupboard as positives ready for projection. As the film travels down the machine, it is first developed to a negative, the developed sil- ver is then removed in a bleaching bath, the film is cleared of the bleach and resensitized, and it is then exposed to an extent dependent upon the original exposure and controlled by the optical density of the film itself. The control is effected by the passage of the film between a source of red light and a thermopile. The current from the thermopile, produced by the heating effect of the red light passing through the film, controls a galvanometer vane which is interposed in an optical system by means of which a beam of white light is projected upon the film. Thus, the second exposure is dependent upon the current in the thermopile, and, therefore, upon the transmission of the red light by the film. After this second exposure, the new image is developed as a positive, the film is fixed, washed and dried; all these oper- ations going on as the film travels forward through the ma- chine. In a little more than an hour from the time the film enters the machine, it is ready for projection. Each machine takes a new film every five minutes. The Eastman processing stations are available all over the world, these containing more than a hundred of the automa- tic machines described above. At the present time, the trav- eler can get his film processed in Rio de Janeiro or in Japan or in China as easily as he can in New York, Rochester or Miami. In a few days, the pictures, ready for projection, are mailed to him by the station. 77