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A Scott Russell linkage is a linkage which translates linear motion through a right angle.. The linkage is named after John Scott Russell (1808–1882), although watchmaker William Freemantle had already patented it in 1803.
The Four Horsemen c. 1496–98 by Albrecht Dürer, depicting the Four Horsemen of the Apocalypse. Woodcut is a relief printing technique in printmaking.An artist carves an image into the surface of a block of wood—typically with gouges—leaving the printing parts level with the surface while removing the non-printing parts.
A passport stamp is an inked impression in a passport typically made by rubber stamp upon entering or exiting a territory.. Passport stamps may occasionally take the form of sticker stamps, such as entry stamps from Japan, South Korea, and Sri Lanka.
A proportion is a mathematical statement expressing equality of two ratios. [1] [2]: =: a and d are called extremes, b and c are called means.. Proportion can be written as =, where ratios are expressed as fractions.
In statistics a population proportion, generally denoted by or the Greek letter, [1] is a parameter that describes a percentage value associated with a population.A census can be conducted to determine the actual value of a population parameter, but often a census is not practical due to its costs and time consumption.