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Glossary of Technical Terms 53
electric current, for detecting its existence, or for determining its direction. In some sound motion picture systems, the device which converts a variable electric current into an oscillating beam of light.
Gamma — The slope of the straight line portion of the characteristic curve of a light-sensitive emulsion.
Glow lamp — A lamp containing a gas which becomes ionized and glows when the potential between its electrodes reaches a critical value.
Graininess — The effect of inhomogeneity exhibited by silver deposits due to the presence of groups or clumps of silver particles.
Ground noise — Any noise due to foreign matter or imperfections in or on the film arising during manufacture, processing, or handling; does not include amplifier or photoelectric cell noises.
Guide Roller — A roller, one flange of which can move in a direction perpendicular to the direction of film motion and so accommodate variations in width of the film.
Harmonic — A vibration, the frequency of which is equal to the product of the frequency of the fundamental and an integer.
H. & D. Curve — The Hurter and Driffield characteristic curve of an emulsion.
Hue — Refers to the position in the spectrum of the dominant color quality.
Impedance — The property of an electric circuit which tends to oppose the passage of current. Impedance is the resultant of resistance and reactance.
Inertia — The value of exposure at which the straight line of the characteristic curve intersects the Log Exposure axis.
Intermittent Sprocket — The sprocket which engages the film to give it intermittent movement at the picture aperture.
Insert — Any photographic subject, without action, in the film.
Interior — Any scene supposed to be taken inside a building.
Iris — ^An adjustable lens diaphragm.
Irising — Gradually narrowing the field of vision by a mechanical device on the camera.
Joining — Splicing into a continuous strip (usually 1,000 feet) the separate scenes, titles, etc., of a picture.
Kerr cell — A device consisting of a pair of electrodes in a liquid which in an electrostatic field has the property of rotating the