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Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...
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 ″. However, for engineering purposes fractions are commonly given to three or four places of decimals and have been ...
United had a 1 + 1 ⁄ 2-inch hole. [20]: 210 2 in (51 mm) Seeburg 1000 records have a 2-inch center hole. [21] 3 in (76 mm) Aretino had a three-inch hole. [20]: 9 The 3-inch spindle format would be resurrected some 40 years later for the Holy Bible Old and New Testaments produced at 16 RPM by the Audio Book Company of St. Joseph, Michigan. The ...
inches/-2, inch/-2, in/-2; inches^2, inch^2, in^2; inches 2, inch 2, in 2 (also denoted by "2) historic engineering drawings ″ (number with a square & a double apostrophe, both as an exponent) The square inch is a common unit of measurement in the United States and the United Kingdom. A common unit of pressure, pound per square inch (psi) is ...
The Fournier scale: two inches in total, divided into four half-inches, the medium intervals are one line (1 ⁄ 12 inch), and the smallest intervals are 1 ⁄ 36 inch; no intervals for the point is given, though. Fournier printed a reference scale of 144 points over two inches; however, it was too rough to accurately measure a single point. [11]
Under the Harappan linear measures, Indus cities during the Bronze Age used a foot of 13.2 inches (335 mm) and a cubit of 20.8 inches (528 mm). [11] The Egyptian equivalent of the foot—a measure of four palms or 16 digits—was known as the djeser and has been reconstructed as about 30 cm (11.8 in).
For example, a wine gallon with a volume of 231 cubic inches (the basis of the U.S. gallon), and an ale gallon of 282 cubic inches, were commonly used for many decades prior to the establishment of the imperial gallon. In other words, a pint of ale and a pint of wine were not the same size.
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 / ˈ θ aʊ / (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 ...