Imperial and US customary measurement systems in the context of "Thousandth of an inch"

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⭐ Core Definition: Imperial and US customary measurement systems

The imperial and US customary measurement systems are both derived from an earlier English system of measurement which in turn can be traced back to Ancient Roman units of measurement, and Carolingian and Saxon units of measure.

The US Customary system of units was developed and used in the United States after the American Revolution, based on a subset of the English units used in the Thirteen Colonies. It is the predominant system of units in the United States and its territories, except for Puerto Rico and Guam, where the metric system was introduced under Spanish rule and remains prevalent. The imperial system of units was developed and used in the United Kingdom and its empire beginning in 1824. The metric system has, to varying degrees, replaced the imperial system in the countries that once used it.

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👉 Imperial and US customary measurement systems in the context of Thousandth of an inch

A thousandth of an inch is a derived unit of length in a system of units using inches. Equal to 1⁄1000 of an inch, a thousandth is commonly called a thou /ˈθaʊ/ (used for both singular and plural) or, particularly in North America, a mil (plural mils).

The words are shortened forms of the English and Latin words for "thousand" (mille in Latin). In international engineering contexts, confusion can arise because mil is a formal unit name in North America but mil or mill is also a common colloquial clipped form of millimetre. The units are considerably different: a millimetre is approximately 39 mils.

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Imperial and US customary measurement systems in the context of Standard-gauge railway

A standard-gauge railway is a railway with a track gauge of 1,435 mm (4 ft 8+1⁄2 in). The standard gauge is also called Stephenson gauge (after George Stephenson), international gauge, UIC gauge, uniform gauge, normal gauge in Europe, and SGR in East Africa. It is the most widely used track gauge around the world, with about 55% of the lines in the world using it.

All high-speed rail lines use standard gauge except those in Russia, Finland, Uzbekistan, and some line sections in Spain. The distance between the inside edges of the heads of the rails is defined to be 1,435 mm except in the United States, Canada, and on some heritage British lines, where it is defined in U.S. customary/British Imperial units as exactly "four feet eight and one half inches", which is equivalent to 1,435.1 mm.

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LINKED FROM (PARENTS)
← Standard-gauge railway ← Thousandth of an inch ← Standard gauge ← Standard-gauge
LINKS TO (CHILDREN)
United States Custom House and Post Office (Cincinnati) → United States Department of the Treasury → United States Congress → System of weights and measures → English units of measurement → Ancient Roman units of measurement → Carolingian Renaissance → Saxons → United States customary units → American Revolution → Thirteen Colonies → Territories of the United States → Puerto Rico → Guam → Metric system → Spanish America → Imperial units → British Empire →