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The quarter of a yard (9 inches) was known as the "quarter" without further qualification, while the sixteenth of a yard (2.25 inches) was called a nail. [62] The eighth of a yard (4.5 inches) was sometimes called a finger, [63] but was more commonly referred to simply as an eighth of a yard, while the half-yard (18 inches) was called "half a ...
The factor–label method can convert only unit quantities for which the units are in a linear relationship intersecting at 0 (ratio scale in Stevens's typology). Most conversions fit this paradigm. An example for which it cannot be used is the conversion between the Celsius scale and the Kelvin scale (or the Fahrenheit scale). Between degrees ...
In Canadian football, the clock runs during a conversion attempt except during the last three minutes of each half. A small plastic tee, which can be 1 to 2 inches (25–51 mm) high (smaller than the kickoff tee), may be used for field goals and extra points in some leagues, including U.S. high schools and Canadian amateur play.
For measuring length, the U.S. customary system uses the inch, foot, yard, and mile, which are the only four customary length measurements in everyday use.From 1893, the foot was legally defined as exactly 1200 ⁄ 3937 m (approximately 0.304 8006 m). [13]
The United States adopted the conversion factor 1 metre = 39.37 inches by an act in 1866. [30] In 1893, Mendenhall ordered the physical realization of the inch to be based on the international prototype metres numbers 21 and 27, which had been received from the CGPM, together with the previously adopted conversion factor. [31]
A relative measure of how many yards a team must travel in order to score. first down The first of a set of four downs. Usually, a team which has a first down needs to advance the ball ten yards to receive another first down, but penalties or field position (i.e. less than ten yards from the opposing end zone) can affect this. flag
In both customary and imperial units, one foot comprises 12 inches, and one yard comprises three feet. Since an international agreement in 1959, the foot is defined as equal to exactly 0.3048 meters. Historically, the "foot" was a part of many local systems of units, including the Greek, Roman, Chinese, French, and English systems. It varied in ...
That same year, the CFL also moved back its line of scrimmage for one-point converts to the 25-yard line (while moving the scrimmage line for a two-point convert ahead two yards to the 3-yard line), thus making the length for a one-point attempt the same in both the NFL and CFL (taking into account the NFL's goalposts on the end line, and the ...