The earliest known reference to the inch in England is from the Laws of Æthelberht dating to the early 7th century, surviving in a single manuscript, the Textus Roffensis from 1120. History Mid-19th-century tool for converting between different standards of the inch
Measuring tape calibrated in 32nds of an inch Equivalents However, for engineering purposes fractions are commonly given to three or four places of decimals and have been for many years. Subdivisions of an inch are typically written using dyadic fractions with odd number numerators for example, two and three-eighths of an inch would be written as 2 + 3 / 8″ and not as 2.375″ nor as 2 + 6 / 16″. (This is akin to how the first and second "cuts" of the hour are likewise indicated by prime and double prime symbols, and also the first and second cuts of the degree.) For example three feet, two inches can be written as 3 ′ 2″.
1.7 cm to mm iso#
The international standard symbol for inch is in (see ISO 31-1, Annex A) but traditionally the inch is denoted by a double prime, which is often approximated by a double quote symbol, and the foot by a prime, which is often approximated by an apostrophe. Inches are commonly used to specify the diameter of vehicle wheel rims, and the corresponding inner diameter of tyres in tyre codes. For the United Kingdom, guidance on public sector use states that, since 1 October 1995, without time limit, the inch (along with the foot) is to be used as a primary unit for road signs and related measurements of distance (with the possible exception of clearance heights and widths) and may continue to be used as a secondary or supplementary indication following a metric measurement for other purposes. In most of continental Europe, the inch is also used informally as a measure for display screens. It is also used in Japan for electronic parts, especially display screens. The inch is a commonly used customary unit of length in the United States, Canada, and the United Kingdom. Examples include Catalan: polzada ("inch") and polze ("thumb") Czech: palec ("thumb") Danish and Norwegian: tomme ("inch") tommel ("thumb") Dutch: duim (whence Afrikaans: duim and Russian: дюйм) French: pouce Georgian: დუიმი, Hungarian: hüvelyk Italian: pollice Portuguese: polegada ("inch") and polegar ("thumb") ("duim") Slovak: palec ("thumb") Spanish: pulgada ("inch") and pulgar ("thumb") and Swedish: tum ("inch") and tumme ("thumb"). In the Dutch language a term for inch is engelse duim (english thumb). In many other European languages, the word for "inch" is the same as or derived from the word for "thumb", as a man's thumb is about an inch wide (and this was even sometimes used to define the inch ). "Inch" is cognate with " ounce" ( Old English: ynse), whose separate pronunciation and spelling reflect its reborrowing in Middle English from Anglo-Norman unce and ounce. Both were features of Old English phonology see Phonological history of Old English § Palatalization and Germanic umlaut § I-mutation in Old English for more information. The consonant change from the Latin /k/ (spelled c) to English /tʃ/ is palatalisation. The vowel change from Latin /u/ to Old English /y/ (which became Modern English /ɪ/) is known as umlaut. The English word "inch" ( Old English: ynce) was an early borrowing from Latin uncia ("one-twelfth Roman inch Roman ounce"). Standards for the exact length of an inch have varied in the past, but since the adoption of the international yard during the 1950s and 1960s the inch has been based on the metric system and defined as exactly 25.4 mm. Derived from the Roman uncia ("twelfth"), the word inch is also sometimes used to translate similar units in other measurement systems, usually understood as deriving from the width of the human thumb. It is equal to 1 / 36 yard or 1 / 12 of a foot. The inch (symbol: in or ″) is a unit of length in the British imperial and the United States customary systems of measurement. Measuring tape with inches A fire hydrant marked as 3-inch For other uses, see Inch (disambiguation).
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