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Glossary of Technical Terms 63
Tri-color ratio — The ratio between inertias of an emulsion for violet and blue (wave length — 350 to 500 mpi approximately) green and yellow (wave-length 500 to 590 mpL approximately) and red (590 to 700 mu approximately). Acetylene flame screened to daylight quality is usually used as a source.
Trailer — That piece of blank film attached to the end of a picture series.
Unmodulated density — In sound-on-film processes, the density of the developed sound track obtained with the exciting lamp glowing but with its output unmodulated by sound.
Variable Area Sound Track — The type of sound track in which the sound is represented by the irregularity of a boundary line running, in a general way, parallel to the sides of the sound track and dividing it into opaque and transparent areas.
Variable Density Sound Track — The type of sound track in which the sound is represented by parallel lines of varying density of opacity perpendicular to the edge of the sound track and extending across its full width.
Velocity Constant (for development) — The speed with which an emulsion developes
K — 1 log; Doo
t Doo— D.
Vibrator — An oscillograph vibrator used as part of the galvanometer for variable area recording.
Visibility of Eadiation of a Particular Wave length — The ratio of the luminous flux at that wave length to the corresponding radiant flux.
Vision — A new subject introduced into the main picture, by the gradual fading-in and fading-out of the new subject, as, for example, the visualization of a thought.
Volt — The unit of measure of electro-motive force, potential, or electrical pressure in a circuit.
Volume control — A variable resistance or other circuit arrangement in the vacuum tube amplifier circuits employed to control the loudness of the reproduced sound coming from the loudspeakers.
Watt — The unit of quantity of electrical power.
Wave length — In any wave motion, the distance between any two