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Fig. 9. The Reeves 35mm "Magna-Striper" installed at Fox Laboratories.
combinations, including a 35mm and 16mm sound-recording negative, Panchromatic and certain reversal color films. The sound-recording material is used by Columbia and others to record simultaneously an optical track and a magnetic track on the same film. The optical track is then used in editing and the final mix is made from the magnetic stripe, thus preserving the quality advantage of the magnetic system for the final mix. The prestriped negative materials are expected to prove useful for newsreels and similar uses where time does not permit the striping after editing and for classified work where the film must not be permitted out of the hands of the agency responsible. The Minnesota Mining process, which transfers a magnetic coating from a temporary tape support to the film, was
improved during the year by the addition of a pretreatment process which permits the stripe to adhere on either emulsion or base side of the film, and to film of any age or previous history. Commercial field trials have been run on this process at the Calvin Laboratories, Kansas City, Mo., and at McGeary-Smith Laboratories in Washington, D.C. Tracks of any width between 0.025 in. and 0.125 in. can be striped at 100 ft/min.
The Minnesota Mining Tape #125 is a new full-coated film stock for original recording and editing work. The "highoutput" oxide coating increases the output about 10 db and has recording characteristics similar to the #120 "highoutput" magnetic tape introduced in 1953.
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May 1954 Journal of the SMPTE Vol. 62