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A phonograph record (also known as a gramophone record, especially in British English ), a vinyl record (for later varieties only), or simply a record or vinyl is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove. The groove usually starts near the outside edge and ends near the center of the disc.
The Chomsky hierarchy in the fields of formal language theory, computer science, and linguistics, is a containment hierarchy of classes of formal grammars. A formal grammar describes how to form strings from a language's vocabulary (or alphabet) that are valid according to the language's syntax. The linguist Noam Chomsky theorized that four ...
The 1920s (pronounced "nineteen-twenties" often shortened to the "' 20s" or the "Twenties") was a decade that began on January 1, 1920, and ended on December 31, 1929. In America, it is frequently referred to as the "Roaring Twenties" or the "Jazz Age", while in Europe the period is sometimes referred to as the "Golden Twenties" [1] because of the economic boom following World War I (1914–1918).
(2+1)" indicates a group of two flashes, followed by one flash. A specific case sometimes used [2] is when the flashes are longer than two seconds. Such a light is sometimes denoted "long flashing" with the abbreviation "L.Fl". If the frequency of flashes is high (more than 30 [3] or 50 [2] per minute) the light is denoted as a "quick light ...
The 37.5 mm length is not derived by a certain scale ratio. While HO scale is a 1:87 scale (3.5 mm to 1 foot), resulting in a 16.5 mm ( 0.65 in) gauge from real life prototype 1,435 mm ( 4 ft 81⁄2 in) standard gauge standard gauge. Conversely, modeling standard gauge in Lego trains would yield a scaling of (37.5:1435 =) 1:38.3.
Thomas Edison. Thomas Alva Edison (February 11, 1847 – October 18, 1931) was an American inventor and businessman. [ 1][ 2][ 3] He developed many devices in fields such as electric power generation, mass communication, sound recording, and motion pictures. [ 4]
Schematic of a machine tap. Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter.. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.
British Standard Whitworth(BSW) is an imperial-unit-based screw threadstandard, devised and specified by Joseph Whitworthin 1841 and later adopted as a British Standard. It was the world's first national screw thread standard, and is the basis for many other standards, such as BSF, BSP, BSCon, and BSCopper. History.