screen persistence
41Light gun — A light gun is a pointing device for computers and a control device for arcade and video games. The first light guns appeared in the 1930s, following the development of light sensing vacuum tubes. It was not long before the technology began… …
42Screensaver — A screensaver is a type of computer program initially designed to prevent Phosphor burn in on CRT and plasma computer monitors by blanking the screen or filling it with moving images or patterns when the computer is not in use. Today,… …
43ZX Spectrum graphic modes — The ZX Spectrum is generally considered to have limited graphical capabilities in comparison to other home computers of the same era such as the Commodore 64, largely due to its lack of a dedicated graphics chip. Nevertheless, throughout its… …
44Monochrome monitor — An IBM computer with a green monochrome monitor A monochrome monitor is a type of CRT computer display which was very common in the early days of computing, from the 1960s through the 1980s, before color monitors became popular. They are still… …
45Oscilloscope — This article is about current oscilloscopes, providing general information. For history of oscilloscopes, see Oscilloscope history. For detailed information about various types of oscilloscopes, see Oscilloscope types. Illustration showing the… …
46optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… …
47Elizabeth Taylor — For other people named Elizabeth Taylor, see Elizabeth Taylor (disambiguation). Elizabeth Taylor …
48Weather forecasting — weather forecaster redirects here. For other uses, see Weatherman (disambiguation). Forecast of surface pressures five days into the future for the north Pacific, North America, and north Atlantic ocean. Weather forecasting is the application of… …
493-D film — In film, the term 3 D (or 3D) is used to describe any visual presentation system that attempts to maintain or recreate moving images of the third dimension, the illusion of depth as seen by the viewer.The technique usually involves filming two… …
50Spectrum analyzer — A spectrum analyzer Spectrum analyzer display A spectrum analyzer measures the magnitude of an input signal versus frequency with …
