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ABSTRACTS OF CONVENTION PAPERS
imposing huge voltages and currents upon a single system, in which ionization and precipitation took place in the same chamber, the new system consists of two parts. The first is made up of cylindrical rods alternating with small tungsten wires on which a potential of 12,000 volts at very low current is imposed. This creates an electrostatic field that charges all solid particles passing through it. The air-stream carrying these charged particles then passes through plates alternately charged negative and positive. The charged particles are precipitated against the oppositely charged plates. The efficiency of the system is such that guarantees can be made to remove 90 per cent of all solid particles in the airstream down to and including Vio of one micron in size. Ordinary air filters range in efficiency from 12 to about 40 per cent by particle count.
Of particular interest to motion picture engineers is the fact that three of the leading film-producing manufacturers in this country have adopted this system for air-cleaning in their plants. Several of the more prominent exhibitors are considering using it in some of their theaters. It is possible to maintain a much cleaner condition in the theaters themselves and thereby produce economy in redecorating the interiors. Furthermore, great savings are possible in the amount of outside air needed in air-conditioning systems, which will enable engineers to specify lower capacity cooling units without sacrificing any cooling effect whatsoever.
A number of installations are discussed describing the various aspects of particular interest to motion picture engineers.
Color Television; PETER C. GOLDMARK, Columbia Broadcasting System, Inc., New York, N. Y.
The paper will be introduced with a brief history of color television and the reasons leading up to the CBS color television System. A general theory for color television, including color, flicker, and electrical characteristics, will be given. Equipment designed and constructed for color television transmission and reception will be discussed. Slides illustrating circuits, equipment, and actual color pictures will be shown.
Synthetic Aged Developers by Analysis; R. M. EVANS, W. T. HANSON, JR., AND P. K. GLASOE, Eastman Kodak Co., Rochester, N. Y.
The dropping mercury electrode is applied to the problem of analyzing aged photographic developers, and new tests are described for elon and hydroquinone. The question of suitable tests for bromide is discussed and it is shown that the bromide test must be independent of chloride. Such a test is described.
Using these new technics and others it is demonstrated that it is possible and practicable by chemical analysis alone to match exactly the photographic characteristics of an aged MQ developer. The only elements necessary for such an analysis are elon, hydroquinone, sulfite, salt concentration, pH, bromide, and iodide. The precision required for the proper analysis for each constitutent has been investigated and is reported for three developer-film combinations. In general the precision required is different for every combination.