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1949 COLOR LABORATORY 57
will include complete channels for recording and re-recording variablearea and variable-density tracks and the necessary accessory instruments for measurements.
PROJECTION ROOM
The projector is a standard Super-Simplex E7. Because of the relatively short throw, wire screens are used in the light beam to reduce the screen brightness to I0l/z foot-lamberts.
A photograph taken from the front of the review room is shown in Fig. 7. For the acoustical treatment of the walls and ceiling, perforated panels of Johns-Manville gray Transite backed up with rock wool are arranged appropriately with unperf orated panels of the same material. The floor is carpeted to within 1 1 feet of the screen. Live sections in the front of the room are provided in order to give the optimum results at the rear three rows of seats. Measurement of the reverberation time as a check on the efficiency of the design gave results very close to the desired theoretical values.
REFERENCES
(1) J. L. Forrest, "Machine processing of 16-mm Ansco color film," J. Soc. Mot. Pict. Eng., vol. 45, pp. 313-327; November, 1945.
(2) J. E. Bates and I. V. Runyan, "Processing control procedures for Ansco color film," J. Soc. Mot. Pict. Eng., this issue, pp. 3-25.
(3) A. H. Brunner, Jr., P. B. Means, Jr., and R. H. Zappert, "Analysis of developers and bleach for Ansco color film," J. Soc. Mot. Pict. Eng., this issue, pp. 2536.
(4) L. S. Dunn, "The new Acme-Dunn optical printer," J. Soc. Mot. Pict. Eng., vol. 42, pp. 204-211; April, 1944.