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Cathode Ray Tube Amusement Device (1947) | World's first electronic game | Gameplay

The cathode-ray tube amusement device is the earliest known interactive electronic game with an electronic display.

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The cathode-ray tube amusement device is the earliest known interactive electronic game with an electronic display. The device simulates an artillery shell arcing towards targets on a cathode ray tube (CRT) screen, which is controlled by the player by adjusting knobs to change the trajectory of a CRT beam spot on the display in order to reach plastic targets overlaid on the screen. Thomas T. Goldsmith Jr. and Estle Ray Mann constructed the game from analog electronics and filed for a patent in 1947, which was issued the following year. The gaming device was never manufactured or marketed to the public, so it had no effect on the future video game industry. Under most definitions, the device is not considered a video game, as while it had an electronic display it did not run on a computing device. Therefore, despite its relevance to the early history of video games, it is not generally considered a candidate for the title of the first video game.

The cathode-ray tube amusement device consists of a cathode ray tube connected to an oscilloscope with a set of knobs and switches. The device uses purely analog electronics and does not use any digital computer or memory device or execute a program. The CRT projects a spot on the oscilloscope display screen, which traces a parabolic arc across the screen when a switch is activated by the player. This beam spot represents the trajectory of an artillery shell. Overlaid on the screen are transparent plastic targets representing objects such as airplanes. At the end of the spot's trajectory, the beam defocuses, resulting in the spot expanding and blurring. This represents the shell exploding as if detonated by a time fuze. The goal of the game is to have the beam defocus when it is within the bounds of a target. Prior to the beam spot beginning its arc, the player can turn the control knobs to direct the beam spot's trajectory and adjust the delay of the shell burst. The machine can be set to fire a "shell" either once or at a regular interval, which is adjustable by the player. This gives the player the goal of hitting one of the overlay targets with the shell burst within a time limit. The player was recommended to make the trajectory far removed from a straight line "so as to require an increased amount of skill and care".

The cathode-ray tube amusement device was invented by physicists Thomas T. Goldsmith Jr. and Estle Ray Mann. The pair worked at television designer DuMont Laboratories in Passaic, New Jersey specializing in the development of cathode ray tubes that used electronic signal outputs to project a signal onto television screens. Goldsmith, who had received a Ph.D. in physics from Cornell University in 1936 with a focus on oscilloscope design, was at the time of the device's invention the director of research for DuMont Laboratories. The two inventors were inspired by the radar displays used in World War II, which Goldsmith had worked on during the war. The patent for the device was filed on January 25, 1947 and issued on December 14, 1948. The patent, the first for an electronic game, was never used by either the inventors or DuMont Laboratories, and the device was never manufactured beyond the original handmade prototype. Institute of Electrical and Electronics Engineers historian Alex Magoun has speculated that Goldsmith did not make the prototype with the intent for it to be the basis of any future production, but only designed the device as a demonstration of the kind of commercial opportunities DuMont could pursue. Video game historian Alexander Smith has also speculated that DuMont's ongoing financial issues prevented any investment into a new product. Goldsmith did not work on games after the invention of the device; he was promoted to vice president in 1953 and left DuMont—by then split up and sold to other firms—to become a professor of physics at Furman University in 1966. Goldsmith kept the device and brought it with him to Furman; in a 2016 interview fellow

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