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A person taking the test covers one eye from 6 metres or 20 feet away, and reads aloud the letters of each row, beginning at the top. The smallest row that can be read accurately indicates the visual acuity in that specific eye. The symbols on an acuity chart are formally known as "optotypes". Variation of Snellen chart with another letter ...
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 ...
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]
The contemporary computer PostScript pica is exactly 1 ⁄ 6 of an inch or 1 ⁄ 72 of a foot, i.e. 4.2 3 mm or 0.1 6 in. Publishing applications such as Adobe InDesign and QuarkXPress represent pica measurements with whole-number picas left of a lower-case p , followed by the points number, for example: 5p6 represents 5 picas and 6 points, or ...
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Some engineering students and engineers carried ten-inch slide rules in belt holsters, a common sight on campuses even into the mid-1970s. Until the advent of the pocket digital calculator, students also might keep a ten- or twenty-inch rule for precision work at home or the office [24] while carrying a five-inch pocket slide rule around with them.
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