Business screen magazine (1938)

♦ The DcVry model G silent sound projector has been improved and is shown (right) with the new reverse switch, automatic rewind and stop-on-film feature. This machine now weighs less than ten pounds and has been placed in wide use in commercial and educational departments as a desk and showroom demonstration unit. There are many fields of use for the silent projector applied in this wa\'. One large company has employed ovir 1,01)0 of the units for local dealer use. Although sound has recognized advantages, the silent film is useful. DISCUSS FILM REJUVENATING • Business Screen quotes J. A, Norling and Albert P. Rippenbein, industrial film authorities, in these interesting remarks concerning the treatment for rejuvenating and preserving motion picture films: "A photographic film contains colloidal systems which tentl to change as the film ages. This change develops serious symptoms: the film shrinks and tends to become dry and brittle. The mechanical strains and stresses to which dry and brittle films are subjected during use soon cause a breakdown of perforations. "The nature of the photographic emulsion and .likewise, of the base makes it a receptive medium for accumulating moisture, oil and dirt. The substances of which the emulsion is composed are not highly resistant to abrasion, and scratches become receptacles for dirt. The dirtier a scratch, the worse it appears when projected. Therefore, when a film becomes scratched during the first run, which may occur on poor equipment or on good equipment improperly operated, subsequent use of the film will make these original scratches more and more apparent. In addition, new scratches will be added constantly, and. by the time the print arrives in the smaller theaters, it has acquired the 'rainy" appearance which has been a source of much perturbation. "There are two treatments: (a) the rejuvenation or regeneration process, by means of which worn and damaged negatives and positives are restored to good condi tion, and (b) the impregnationpreservation process, by means of which new negatives and prints are given a longer life in service or in storage. The processes do not involve the use of lacquers or coatings, but depend upon the swelling and contraction of the film and the glazing of the surface in order to resist scratching and accumulation of surface dirt". Mr. Rippenbein. co-author of the remarks quoted above, is an authority on this rejuvenation process and is connected with the firm of .\meriran Reeono. Inc. NEW "SYNC" MUTOR DRIVE * To meet the needs of recording laboratories which must screen films at exactly 54 frames per second while voice or soun<l effects are being "dubbed in". Bell & Howell announces a synchronous motor drive designed for the Filmosound Model 138 and Filmo silent projectors Models 51 and li9. It is recommended that the installation be made on the Filmosound inasmuch as it can be used for projecting either sound or silent film. The synchronous motor is used only to drive the projector mechanism, the projector motor being used to drive the fan. and in Model 138 Filmosound. the take-up also. To avoid overloading the synchronous motor or gearing it is essential that the projector be equipped with a clutch, which remains disengaged at all times when the synchronous motor is attached. Clutch installations are made by Bell & Howell. The synchronous motor drive is supplied on special order only, the installation being made by Bell & Howell. YOUR AUDIENCE ^e«^ "SCRATCHES" RAIN-DIRT! You would "fire" the salesman who called on your customers dressed sloppily — THEREFORE WHY NOT MAINTAIN THE PERFECT APPEARANCE OF YOUR FILM SALESMEN? Film cannot be made scratch-proof — but there is ONE WAY of removing scratches — rain — dirt, and that is by RECONO REJUVENATION. RECONO has been used exclusively by the Motion Picture Producers for the past 9 years. It is now being made available to the non-theatrical trade. THE COST IS VERY LOWl FREE OFFER! Send us a reel of positive (400 ft. 16mm. 1000 ft. 35mm.) and let us show you the improvement effected by RECONO REJUVENATION TREATMENT AT NO COST TO YOU. AMERICAN RECONO, Inc. 245 West 55th Street New York, N. Y. P.S. You may not realize it but films put in storage may be deteriorating in the cans. Films should be inspected periodically. We have saved many an important picture for our clients. Avail yourself of our inspection service. 3; nstinciiiLslicJi LI The Drake offers every luxury and convenience of fine living on Chicago's Gold Coast, overlooking Lake Michigan. A S. Kirkeby. Managing Director LAKE SHORE DRIVE • CHICAGO 37