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DESIRABLE POSITION FOR HALF-TRACK MASK
Fig. 6. (A) RCA Optical System, plan view; (B) Westrex Optical System, plan view.
(b) To place within the single-track area of a standard 35mm or 16mm negative two separate sound versions: i.e., English and French tracks, two English tracks, etc.
Where separate language versions are required, the originals are recorded separately in the regular manner on 35mm magnetic stock. These tracks may then be transferred to the masked recorder as described above.
The particular advantages of doubletrack sound negatives are:
(a) The laboratory printing step is reduced to a standard single operation and consequently two print versions may be produced for the price of one.
(b) Any overlap of the masks on the sound negative record is reproduced as a continuous black unmodulated line on the print. This is preferable to the white line left by overlapping of the masks on the release printer since this
would raise the noise level when reproduced on full-width scanning.
(c) On a recorder greater accuracy of center-line placement can be assured and the danger of clipping is reduced. In addition, negative recording stock is usually in good physical condition so that no compensation for shrinkage need be applied.
Projector Conversion
The prototype model shown here (Fig. 7) is a very simple adaptor which may be fitted to most 16mm projectors. The pivoted mask is U-shaped, with adjusting screws for proper horizontal positioning of the projector sound scanning beam. Since the vertical dimension of the scanning beam is defined by the optical system of the projector, no provision need be made for this on the adaptor. This fortunate circumstance greatly reduces the manu
July 1952 Journal of the SMPTE Vol. 59