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In 1677, Henry Coggeshall created a two-foot folding rule for timber measure, called the Coggeshall slide rule, expanding the slide rule's use beyond mathematical inquiry. In 1722, Warner introduced the two- and three-decade scales, and in 1755 Everard included an inverted scale; a slide rule containing all of these scales is usually known as a ...
A sliding tackle, also called slide tackle, is a tackle in association football in which one leg extends to push the ball away from the opposing player. Sliding tackles can often be sources of controversy, particularly when players being tackled fall down over the tackler's foot (or the ball stopped by the tackler's foot), and penalties, free ...
On November 6, 1869, Rutgers University faced Princeton University (then known as the College of New Jersey) in a game that was played with a round ball and used a set of rules suggested by Rutgers captain William J. Leggett, based on London's The Football Association's first set of rules, which were an early attempt by the former pupils of ...
The official playing field in Canadian football is larger than the American, and similar to American fields before 1912. The Canadian field of play is 110 by 65 yards (100.6 by 59.4 m), compared to 100 by 53 + 1 ⁄ 3 yards (91.4 by 48.8 m) in American football.
The history of American football can be traced to early versions of rugby football and association football.Both games have their origin in multiple varieties of football played in the United Kingdom in the mid-19th century, in which a football is kicked at a goal or kicked over a line, which in turn were based on the varieties of English public school football games descending from medieval ...
A quarterback scramble in the 2007 Hawaii Bowl.. In gridiron football, a quarterback scramble or scramble is an impromptu maneuver or run by a quarterback.If a quarterback is under pressure by an opposing team's defense, he may run forward, backward, or laterally in an attempt to avoid being tackled behind the line of scrimmage for a sack.
In 1722, Warner introduced the two- and three-decade scales, and in 1755 Everard included an inverted scale; a slide rule containing all of these scales is usually known as a "polyphase" rule. In 1815, Peter Mark Roget invented the log log slide rule, which included a scale displaying the logarithm of the logarithm. This allowed the user to ...
The various codes of football share certain common elements and can be grouped into two main classes of football: carrying codes like American football, Canadian football, Australian football, rugby union and rugby league, where the ball is moved about the field while being held in the hands or thrown, and kicking codes such as association football and Gaelic football, where the ball is moved ...