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  2. Optical sound - Wikipedia

    en.wikipedia.org/wiki/Optical_sound

    For half a century, cinema sound systems were licensed to either RCA or Western Electric, and motion picture producers elected to license one or the other, or even both. This continued until 1976, by which time optical sound recording had been converted to the Western Electric (dubbed "Westrex") stereo variable-area system.

  3. Stereophonic sound - Wikipedia

    en.wikipedia.org/wiki/Stereophonic_sound

    The progress of stereophonic sound was paced by the technical difficulties of recording and reproducing two or more channels in synchronization with one another and by the economic and marketing issues of introducing new audio media and equipment. A stereo system cost up to twice as much as a monophonic system since a stereo system contains two ...

  4. Practical shooting - Wikipedia

    en.wikipedia.org/wiki/Practical_shooting

    Practical shooting, also known as dynamic shooting or action shooting, is a set of shooting sports in which the competitors try to unite the three principles of precision, power, and speed, by using a firearm of a certain minimum power factor to score as many points as possible during the shortest time (or sometimes within a set maximum time).

  5. Shooting sports - Wikipedia

    en.wikipedia.org/wiki/Shooting_sports

    Shooting sports is a group of competitive and recreational sporting activities involving proficiency tests of accuracy, precision and speed in shooting — the art of using ranged weapons, mainly small arms (firearms and airguns, in forms such as handguns, [1] rifles [2] and shotguns [3]) and bows/crossbows.

  6. Stereoscope - Wikipedia

    en.wikipedia.org/wiki/Stereoscope

    A stereo transparency viewer is a type of stereoscope that offers similar advantages, e.g. the View-Master. Disadvantages of stereo cards, slides or any other hard copy or print are that the two images are likely to receive differing wear, scratches and other decay. This results in stereo artifacts when the images are viewed.

  7. Telescopic sight - Wikipedia

    en.wikipedia.org/wiki/Telescopic_sight

    Typical standard parallax-free distances for hunting telescopic sights are 100 yards (91 m) or 100 meters (109 yd) as most sport hunting rarely exceed 300 yards (270 m). Some long-range target and "tactical-style" sights without parallax compensation may be adjusted to be parallax-free at ranges up to 300 yards (270 m) to make them better ...

  8. Shooting range - Wikipedia

    en.wikipedia.org/wiki/Shooting_range

    A shooting range, firing range, gun range or shooting ground is a specialized facility, venue, or field designed specifically for firearm usage qualifications, training, practice, or competitions. Some shooting ranges are operated by military or law enforcement agencies, though the majority of ranges are privately owned by civilians and ...

  9. United States Practical Shooting Association - Wikipedia

    en.wikipedia.org/wiki/United_States_Practical...

    [citation needed] The rapid shooting on-the-move style of Practical Shooting gave birth to the term "Run and Gun" so commonly used today to describe the sport. For more than 30 years the sport has served as the test bed for new products and the unofficial R&D for the firearms industry.