Journal of the Society of Motion Picture Engineers (1930-1949)

Testing the Exhaustion L. G. Sandys of a Fixing Bath presents his views about how to increase the efficiency of fixing baths and methods of testing in an article, "Efficiency and conservation of fixing baths," published in The British Journal of Photography, Vol. 98, pp. 662-3, Dec. 1951. If a yellow precipitate persists upon the addition of a 4% potassium iodide solution to ten parts of the fixer, it is exhausted. This can be confirmed by agitation with a paddle of some kind and if a lasting froth develops it indicates that the bath is spent. Temperature Control for Film Processing Solutions U.S. Patent #2,584,294 assigned to Remington Rand describes a procedure for isolating the developer and fixer sections of a processing machine by a compartment and circulating heated air from the drying compartment through this chamber. Filter-Aid Aid During the present strike at Johns Manville, users of their Celite filter aids find themselves in a difficult situation. Perhaps the Brown Company of Berlin, N.H., have a solution to this problem with their "Solka-floc" which they claim (1) prevents "leak through" in the filtration process, (2) enables high flow rates, (3) enables controlled porosity in the filter cake and (4) reduces labor cost by diminishing the number of times filter presses have to be cleaned. The general sales office is at 150 Causeway St., Boston, Mass. New Method of VPI (Vapor Phase InRust Prevention hibitor) is chemically known as dicyclohexyl ammonium nitrate and is manufactured commercially by Monsanto Chemical Company. By vaporizing and allowing it to deposit on the product, it is reported to prevent corrosion. It may be used by impregnating paper and lining a drawer with this paper. This will prevent corrosion of anything kept in this drawer. However, its methods of application are numerous. It is nonflammable and will reach areas where usual corrosion preventatives cannot be applied. One gram of VPI provides protection for one cubic foot of metal if properly wrapped to prevent loss of vapor. Meetings American Society of Photogrammetry, Annual Meeting, Jan. 14-16, Shoreham Hotel, Washington, D. C. American Institute of Electrical Engineers (Symposium on the Science of Music and Its Reproduction — 3d Lecture), Jan. 15, Engineering Societies Bldg., New York, N. Y. Society of Motion Picture and Television Engineers, Southwest Subsection Meeting, Jan. 16, Dallas, Tex. American Institute of Electrical Engineers, Winter General Meeting, Jan. 19-23, New York, N. Y. American Physical Society, Annual Meeting, Jan. 22-24, Cambridge, Mass. Institute of Radio Engineers Conference and Electronics Show, 5th Annual Southwestern Conference and Show, Feb. 5-7, San Antonio, Tex. American Institute of Electrical Engineers (Symposium on the Science of Music and Its Reproduction — 4th Lecture), Feb. 20, Engineering Societies Bldg., New York, N. Y. National Electrical Manufacturers Association, Mar. 9-12, Edgewater Beach Hotel, Chicago, 111. Society of Motion Picture and Television Engineers, Southwest Subsection Meeting Mar. 16, Fort Worth, Tex. Inter-Society Color Council, Annual Meeting, Mar. 18, Hotel Statler, New York, N. Y. Optical Society of America, Mar. 19-21, Hotel Statler, New York, N.Y. American Physical Society, Joint Meeting with APS Southeastern Section, Mar. 26-28, Duke University, Durham, N.C. 549