optical sound negative
71Speed of light — The speed of light in the vacuum of free space is an important physical constant usually denoted by the letter c . [NIST and BIPM practice is to use c 0 for the speed of light in vacuum in accord with international standard ISO 31 5. See… …
72Germany — /jerr meuh nee/, n. a republic in central Europe: after World War II divided into four zones, British, French, U.S., and Soviet, and in 1949 into East Germany and West Germany; East and West Germany were reunited in 1990. 84,068,216; 137,852 sq.… …
73nervous system — Anat., Zool. 1. the system of nerves and nerve centers in an animal or human, including the brain, spinal cord, nerves, and ganglia. 2. a particular part of this system. Cf. autonomic nervous system, central nervous system, peripheral nervous… …
74Single-lens reflex camera — The single lens reflex (SLR) camera uses an automatic moving mirror system which permits the photographer to see exactly what will be captured by the film or digital imaging system, as opposed to non SLR cameras where the view through the… …
75Gramophone record — A 12 inch (30 cm) 33⅓ rpm record (left), a 7 inch 45 rpm record (right), and a CD (above) A gramophone record, commonly known as a phonograph record (in American English), vinyl record (in reference to vinyl, the material most commonly used after …
76Citizen Kane — Citizen Kane …
77Impedance matching — In electronics, impedance matching is the practice of designing the input impedance of an electrical load (or the output impedance of its corresponding signal source) to maximize the power transfer and/or minimize reflections from the load.… …
78Lost film — See also: Found film A lost film is a feature film or short film that is no longer known to exist in studio archives, private collections or public archives such as the Library of Congress, where at least one copy of all American films are… …
79Gurgen Askaryan — ( hy. Գուրգեն Ասկարյան , ru. Гурген Аскарьян or Гурген Аскарян ) (1928 1997) was a prominent Soviet physicist, famous for his discovery of the self focusing of light. Among his other achievements are the pioneering studies of light matter… …
80Sony — For other uses, see Sony (disambiguation). Sony Corporation ソニー株式会社 Type Public company Traded as TYO: 6758 …
