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The Paris inch or pouce is an archaic unit of length that, among other uses, was common for giving the measurement of lenses. [1] The Paris inch could be subdivided into 12 Paris lines ( ligne ), and 12 Paris inches made a Paris foot . [ 1 ]
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]
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 ...
1 ⁄ 12 of a pouce. This corresponds to the line, a traditional English unit. pouce: 1 ⁄ 12: 27.07 mm 1.066 in 1 ⁄ 12 of a pied du roi. This corresponds to the inch, a traditional English unit. pied du roi: 1 32.48 cm 1.066 ft Commonly abbreviated to pied, this corresponds to the foot, a traditional English unit.
Metric prefixes; Text Symbol Factor or; yotta Y 10 24: 1 000 000 000 000 000 000 000 000: zetta Z 10 21: 1 000 000 000 000 000 000 000: exa E 10 18: 1 000 000 000 000 000 000: peta P 10 15: 1 000 000 000 000 000: tera T
The pied and pouce, at precisely 333. 3 mm and 27. 7 mm, were about 2.6% larger than the previous Parisian measures and 9% larger than their English counterparts. The aune ( ell ), used to measure cloth, was defined as 120 centimetres, and divided into the demi aune (half an ell, or 60 cm) and the tiers aune (third of an ell, or 40 cm).
Many pre-metric units were reintroduced, with their old relations to each other, but were redefined in terms of metric units. Thus the aune was defined as 120 centimetres and the toise (fathom) as being two metres, with as before six pied (feet) making up one toise, twelve pouce (inches) making up one pied and twelve lignes making up one pouce.
The standardized conversion for a ligne is 2.2558291 mm (1 mm = 0.443296 ligne), [4] and it is abbreviated with the letter L or represented by the triple prime, ‴. [5] One ligne is the equivalent of 0.0888 international inch. This is comparable in size to the British measurement called "line" (one-twelfth of an English inch), used prior to ...