Transactions of the Society of Motion Picture Engineers (1929)

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Glossary of Technical Terms 49 Back-Focus — The distance from the principal focus of a lens to its nearest face. Baffle Blanket — Felt Sheets covered on both sides with muslin and distributed about the set to make it acoustically satisfactory for sound recording. Beat — Interference between two wave trains resulting in alternate reinforcement and destruction of the one by the other. Bel — Ten Decibels. Blooping Patch — A triangular black section introduced over a splice on the positive sound track, to prevent the noise which the splice would otherwise cause during reproduction. The patch effects a relatively gradual diminution in the transmitted light, followed by gradual restoration to the original value. The frequency of the diaphragm movement thus caused being below the threshold of audibility, no sound is heard. The patch may be applied by stencilling with black lacquer, or may be a triangle of black paper or film cemented on the track. Brightness of a Surface — The luminous intensity per unit of projected area. Bullet-type microphone — A condenser microphone and microphone amplifier mounted in a small case. Business — Action by the player ; e.g., business of shutting door. Camera Booth — Sound-proof inclosure for cameras employed to prevent camera noises from interfering with recorded sounds. Camera Marker — The device for marking the picture negative. Camera Motor — A motor for driving a motion picture camera. Candle power — The luminous intensity expressed in candles. Change-Over — In projection, the act of changing from one projector to another preferably without interrupting the continuity of projection. Cine — A prefix used in description of the motion picture art or apparatus. Close-up— Scene or action taken with the character close to the camera. Color Saturation — The ratio of a white light to monochromatic light in a mixture which matches (appears identical with) the color in question. Color Temperature of a Source — The temperature in degrees 9:bso