optical sound negative
61PAL — For other uses, see PAL (disambiguation). Television encoding systems by nation; countries using the PAL system are shown in blue. PAL, short for Phase Alternating Line, is an analogue television colour encoding system used in broadcast… …
62mathematics — /math euh mat iks/, n. 1. (used with a sing. v.) the systematic treatment of magnitude, relationships between figures and forms, and relations between quantities expressed symbolically. 2. (used with a sing. or pl. v.) mathematical procedures,… …
63Electronic amplifier — A practical amplifier circuit An electronic amplifier is a device for increasing the power of a signal. It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. In… …
64Amplifier — For other uses, see Amplifier (disambiguation). Generally, an amplifier or simply amp, is a device for increasing the power of a signal. In popular use, the term usually describes an electronic amplifier, in which the input signal is usually a… …
65Diode — Figure 1: Closeup of a diode, showing the square shaped semiconductor crystal (black object on left) …
66Conan the Barbarian (1982 film) — Conan the Barbarian …
67Image scanner — Desktop scanner, with the lid raised. An object has been laid on the glass, ready for scanning …
68Film preservation — Stacked containers filled with reels of film stock. The film preservation, or film restoration, movement is an ongoing project among film historians, archivists, museums, cinematheques, and non profit organizations to rescue decaying film stock… …
69radiation measurement — ▪ technology Introduction technique for detecting the intensity and characteristics of ionizing radiation, such as alpha, beta, and gamma rays or neutrons, for the purpose of measurement. The term ionizing radiation refers to those… …
70Refraction — For the property of metals, see refraction (metallurgy). For the magic effect, see David Penn (magician). For the refraction in atmosphere, see Atmospheric refraction. Light on air–plexi surface in this experiment mainly undergoes refraction… …
