Journal of the Society of Motion Picture and Television Engineers (1950-1954)

the 35mm negative is mounted on a 3000-ft projection reel. All of the above processing and editing, including transportation of the 35mm negative across town twice, has taken approximately two hours, leaving about a half-hour for threading in the film projection studio. Close examination of Fig. 3 reveals a selsyn interlock distributor motor, chaindriven by the RCA 35mm television projector motor. This interlock motor supplies driving power to one of the RCA rack-mounted 16mm magnetic reproducers located at the right of this picture. The 1 6mm magnetic track therefore runs in perfect lip synchronism with the 35mm picture negative. By simply flipping the iconoscope polarity switch to "Negative" and reshading accordingly, a positive picture image of high quality is obtained from the negative film. The single-system "B" copy is run in a 16mm projector on an adjacent iconoscope, so that in the event of trouble with the "A" copy, a flick of a button will put the "B" copy picture and sound on the air. If 1 6mm release prints are required for syndication, they are obtained by reduction printing from the "A" copy 35mm picture negative and by contact printing from a 16mm negative sound track. Picture quality thus obtained on 16mm release prints is superior to that obtained by contact printing from a 16mm negative of the same subject matter. Although this three-hour time zone delay operation may sound very precarious and nerve wracking, it has been in daily use for one year with very few errors and with picture and sound quality rivaling that of many live shows. Ralph E. Lovell: Kinescope TimeZone Delay 239