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Aug., 1932] PROGRESS COMMITTEE 121
cameramen that the significant property of the product is not so much the increased speed but the "tremendous improvement in photographic quality ..." obtainable by using the new film.
New Materials. — A recent addition to the group of films is the Pankine G-Antihalo film supplied by Agfa. According to Schilling,2 this film is said to be fine grained and to possess greater sensitivity to red, yellow, and green rays than the older Pankine F film. A bluish green anti-halation layer is incorporated between the emulsion and the support, which layer is unaffected by the processing solutions and necessitates only a slight increase in the printing light.
According to D. C. Dunham, Herr Kupfer has completed the development of an aluminum motion picture film band. Because the base is metallic, light must be reflected from it. Refining the clarity of the reflection and achieving in the emulsion combinations that would adhere to the metal have been the two greatest difficulties encountered in completing the invention. In projecting pictures from this metal -backed film, light from the arc is reflected from a mirror to the metal film as it passes over the projecting slot, the light falling on the film at an angle of incidence of 45 degrees. It is claimed that the film itself costs between one-fifth and one-sixth of the amount charged for the celluloid film, and it is also claimed that the metal is more durable than celluloid, does not stretch, and will not break so easily. It is claimed that the new film has been perfected for sound and color reproduction. One hundred and thirty patents covering the production and reproduction of pictures from this film have been taken out in the various countries of the world.
Gradually throughout the year 1931 and in the early months of the present year, film manufacturers have made the improved emulsions available to sheet film users, the cine amateur, and the aerial photographer. For the user of small cameras making single exposures on 35 millimeter film, Kutzleb3 describes a fast panchromatic film that makes possible snapshots in well-lighted rooms. The film is double-coated and has an anti-halation layer. It is now possible to utilize these new emulsions in almost every branch of photographic endeavor.
The Eastman Kodak Company has classified its panchromatic materials into three groups, known as Types A, B, and C.4 Group A includes materials of the same type as those made prior to 1931 ; group B materials, known as "orthopanchromatic," have an extremely high color-sensitivity, corresponding approximately to that of the eye;