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Aug. 1947 CATALOG OF TEST FILMS 169
CODE LENGTH TEST FILM NO. (in Feet) PRICE
the equipment is operated. This film is the 16-mm version of the 35-mm Theater Sound Test Film (ASTR-3) and contains the same main title and choral music, dialog samples, and piano recording. The picture has been optically reduced from 35 to 16 mm and the sound re-recorded from 35 to 16 mm. 16-Mm Multifrequency Test Film Z22.44 150 $41.25
The Multifrequency Test Film is a direct-positive original recording on safety base and is used to obtain the electrical-frequency response at the output of the power amplifier. Each film is individually calibrated on equipment correct within ± 0.25 db up through 3000 cycles and within ± 0.5 db above 3000 and through 7000 cycles. The deviation from the intended flat-response characteristic (assuming negligible reproducing light-beam width) is stated as a correction for each frequency which will give the true level when it is added algebraically to the output-level measurement obtained when using the film.
This test film contains the following series of frequencies, each preceded by a spoken announcement:
cps cps cps cps
400 300 2000 5000
50 500 3000 6000
100 1000 • 4000 7000
200 400
16-Mm Buzz-Track Test Film Z52.10 100 $27.50
The Buzz-Track Test Film is an original negative on safety base and is used for checking scanning-beam placement. The track consists of an 0.076-in. opaque center with a frequency of 300 cycles on the picture side and a frequency of 1000 cycles on the sprocket side. These tracks are accurately located on the film so that when the film is run on a projector in correct adjustment and free from weave, no sound is heard. Either or both the 1000 and 300-cycle tones will be heard, however, if the scanning-light beam is out of position.
16-Mm Scanning-Beam Illumination
Test Film
Laboratory Type Z52.7-L 100 $27.50
Service Type Z52.7-S 100 27.50
The Scanning-Beam Illumination Test Film is a print on safety base and carries a narrow sound track (0.005 in. wide) modulated at constant level by a 1000-cycle tone. The location of this sound track changes at a uniform rate along the length of the film from a position just inside one edge of the scanned area to a position just inside the opposite edge of the scanned area. The narrow 1000-cycle sound track sweeps across the scanning-light beam from one end to the other at a uniform rate, the position of the sound track relative to the ends of the light beam at any instant being shown by an animated diagram appearing in the picture area.
If the scanning-beam illumination were absolutely uniform across the width of the scanned area, the output level of the 1000-cycle tone would be constant. In practice, however, some variation of an output-meter reading will always be