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Aug. 1947 CATALOG OF TEST FILMS 167
CODE LENGTH TEST FILM NO. (in Feet) PRICE
Type B (Snake Track) is used as an 8-ft loop for quick service adjustment of the scanning-beam illumination. It contains a 1000-cycle track with a 0.007-in. amplitude placed on the film in such a way that the track moves across the scanning slit from one edge to the other at a uniform rate.
In order to maintain a constant length of track, and thus hold the scanned area constant, the usual type of film splice should not be used in making up this loop. Instead, a butt-end splice should be employed, obtained by placing the ends of the print securely against" one another without any overlap and joining the two ends with transparent tape, such as Scotch cellophane tape. Experience has shown this splice to be very practicable as it may be remade without any loss of film. In addition, this type of splice disturbs the reading of the volume indicator less than the conventional overlap splice. This film has been prepared for testing the uniformity of the illumination across the scanning slit and is not intended for use to determine slit placement adjustment, for which the Buzz Track should be used. 35-Mm Sound-Focusing Test Film
Type ,4— 9000-Cycle Track A9KC-1 50 min $0.035/ft
Type B— 7000-Cycle Track (Area) . A7KC-1 50 min 0.035/ft
Type C— 7000-Cycle Track (Density) D7KC-1 50 min 0.035/ft
Type C— Acetate Base D7KCS-1 50 min 0.004/ft
The Sound-Focusing Test Films are prints on nitrate base (except D7KCS-1 on acetate base) and are used to adjust the focus and azimuth of soundhead optical systems.
Type A — 9000-Cycle Track (A9KC-1) contains a 9000-cycle variable-area tone recorded at 1 db below 100 per cent modulation with a power output variation of less than it 0.25 db. This film is normally used by manufacturers and laboratories. It is not recommended for theater use.
Type B — 7000-Cycle Track (A7KC-1) contains a 7000-cycle variable-area tone recorded at 2 db below 100 per cent modulation with a power output variation of less than i 0.25 db. This film is used for servicing theater equipment.
Type C— 7000-Cycle Track (D7KC-1} contains a 7000-cycle variable-density tone recorded at 2 db below 100 per cent modulation with a power output variation of less than i 0,25 db. This film is used for servicing theater equipment. Type C is also available on acetate base (D7KCS-1}. These films are available in 50 to 200-ft lengths in multiples of 50 ft. 35-Mm 3000-Cycle Flutter Test Film A3KC-1 50 min $0.05/ft
The 3000-Cycle Flutter Test Film is a toe-recorded variable-density negative on nitrate base and is used in measuring flutter. A flutter bridge is required to make this measurement. The total flutter of this film is not more than 0.06 per cent. A complete analysis of the flutter content is furnished with each purchase of film.
This film is available in 50 to 1000-ft lengths in multiples of 50 ft. 35-Mm 1000-Cycle Balancing Test Film
For Two Machines ABL2-1 14 $0.50
For Three Machines ABL3-1 21 0.75
1000-Cycle Test Film ABLN-1 50 min 0.035/ft