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Fig. 8. Magnastripe film placed on top of picture film for synchronous handling.
form of modulation writing, Paramount and Ryder Services have selected the striped magnetic film shown in Fig. 7A for 35mm editorial work. This has a stripe of magnetic coating 225 mils wide with center line 420 mils from the edge of the film. A 20-mil stripe is placed near the sprocket holes on the side of the film opposite the sound track so as to balance the roll for winding. Figure 7B shows a coating of magnetic film for 17^mm use. In manufacture two stripes of magnetic coating are placed on 35mm film and later slit to give two 17£mm films.
For both 35mm and 17^mm editing, the modulation writing is placed on the film in the clear area between the striping and the sprocket holes. An illustration of the 35mm film along with picture is shown in Fig. 8.
By reviewing Fig. 8 it will be noted that:
1. When the picture and sound films are placed on top of each other, the modulation can be seen by transparency through the clear area of the picture. This procedure is a common editorial practice with optical sound film.
2. The picture can be seen by transparency through the clear area of the sound film. The area available for viewing is the same as under the present practice with 200-mil, push-pull optical recording.
3. The code numbering used for synchronization can be viewed in transparency and matched.
4. The picture and sound film still held together can be run through a picture-only or sound-only magnetic Moviola unit.
5. Markings can be made on the film in crayon or ink and read in transparency as at present. Crayon markings should not be made in the sound track area.
6. These films can be handled in regular existing editorial equipment including synchronous rewinds. The only conversion necessary is the magnetic reproducer on the Moviola and a magnetic reproducer or conversion for the review room.
7. These films can be handled by the existing editorial techniques which have
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February 1952 Journal of the SMPTE Vol. 58