Transactions of the Society of Motion Picture Engineers (1929)

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54 Transactions of S.M.P.E., Vol. XIII, No. 37, 1929 plane of polarization of a beam of polarized light (used in certain systems of photographic sound recording) . Lambert — A unit of brightness which equals l/II candle per square centimeter of projected area. The average brightness of a surface emitting or reflecting one lumen per square centimeter. Lantern Picture — Stereopticon or Lantern picture. A still picture projected on the screen by suitable means. Lantern Slide — (Stereo Slide) — Stereopticon or Lantern Slide. A single transparent picture designed for projection. Leader — That piece of blank film attached to the beginning of the picture series. Lens, Simple — A lens consisting of but a single piece of glass or other transparent medium. Lens, Compound — The combination of a number of simple lenses. Light Beam — A bundle of light rays which has a cross section of appreciable size. Light Ray — A stream of light of inappreciable cross section. Location — A place other than a studio selected for a motion picture scene. Loudspeaker — Device into which a varying electrical current is passed after suitable amplification and which transforms this varying current into mechanical vibrations, thereby producing sound waves. Similar to those producing the varying current. Luminosity curve of a source — A curve showing for each wave length the luminous flux per element of wave length. The product of radiant flux and visibility plotted as a function of wave length. Luminous Flux — The rate of passage of radiant energy evaluated by reference to the luminous sensation produced — also may be accepted as an entity since velocity may be regarded as constant. Luminous Intensity — The luminous intensity of a source in any direction is the luminous flux per steradian in that direction. Magazine Valve — The film opening in the magazine of a motion picture projector. Marker — A device for marking the negative either photographically or mechanically for locating points of synchronism. Martens Photometer — The chief example of a photometer in which