American cinematographer (Jan-Dec 1926)

Twenty-six AMERICAN CINEM ATOGRAPHER June, 1926 8, 4, 2, 1, and Yi minutes. The exposure was made at a distance of 30 cm. (1 ft.) from a Wratten Safelight lamp fitted with a 25 W. bulb. The values for the illumination in foot candles afforded by the different safelights under these conditions are given in Fig. 1. From these strips after development, the longest time of exposure which did not cause visible fog for each time of bathing could be determined. 3. Exhaustion Tests. For the keeping and exhaustion tests solutions were kept in 2 liter glass battery jars which were deep and narrow and simulated the conditions in a large tank. V. The Use of Pinakryptol Green as a Preliminary Bath for Desensitizing Motion Picture Negative and Panchromatic Film /. Effect of Concentration and Time of Bathing on Desensitizing. Various authors 1!> have considered the relation between concentration and desensitizing. As Hubl13' 23 has suggested, it appears that the amount of desensitizing substance which enters the film layer is the determining factor. Desensitizing is very nearly proportional to the concentration of the desensitizing solution, it increases with rise of temperature, and is diminished by anything which retards swelling such as previously hardening with alum . The temperature coefficient of desensitizing varies with the particular dye used. The desensitizing action of pinakryptol green was measured by the tablet method described above, for various concentrations and times of bathing. The results for panchromatic film are given in Fig. 4 in which desensitizing is plotted against concentration of the dye. Desensitizing is stated numerically as the ratio of the original to the final speed. For these tests the time of the preliminary bath was 5 minutes. The results show that within the range studied desensitizing is directly proportional to the concentration. The curves for the different safelights have no relation to each other in the sense of absolute safety, but each represents the increased safety due to desensitizing for that particular light. (Continued Next Month) Special Representative Joins American Cinematographer Staff C. K. Phillips, well known in the motion picture trade paper advertising field in Hollywood, has joined the staff of the American Cinematographer as special representative. Before joining the staff of this publication, Mr. Phillips worked as advertising representative on the Year Book, the Laemmle number and other special editions of the Film Daily, of which Harvey Gausman is west coast manager. Eastman Kodak Stores Open Los Angeles Kodak Building The Eastman Kodak Stores, Inc., have removed to the new Kodak Building, at 643 South Hill Street, Los Angeles. The new building is a Class-A structure, with 30,000 feet of floor space devoted to the photographic supply business. The retail salesroom and the professional sales department are located on the ground floor. The second floor is devoted to display rooms for professional photographic apparatus, special stock rooms, projecting room and the general offices. The third floor contains a finishing plant, a repair department, steel die embossing department and a display room for used apparatus. The basement contains stock rooms, storage vaults, and the packing and shipping department. International Makes Gain on Earnings During 1925 Earning for 1925 of the industries acquired by the International Projector Corp. were $756,666, against $605,519 in 1924, an increase of 25 per cent. The ratio of current assets to current liabilities exceeded six to one, net current assets on Dec. 31, 1925, being $1,299,578. The International Projector Corp. was formed last year to acquire the entire business and assets of Nicholas Power Company, Inc., the Precision Machine Co., Inc., both of New York, and the Acme M. P. Company, of Chicago. SUBSCRIBE FOR THE American Cinematographer AMERICAN CINEMATOGRAPHER, 1219-20-21-22 Guaranty B!d*., 6331 Hollywood Blvd., Hollywood, Calif. Gentlemen: Please find enclosed three dollars (foreign rates additional), for one year's subscription to the AMERICAN CINEMATOGRAPHER, to begin with the Issue of ioa Name Address Town State (Note: Camera Craft will be sent for a slight additional sum. Consult the clubbing offer.)