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A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]
In mathematics, a Golomb ruler is a set of marks at integer positions along a ruler such that no two pairs of marks are the same distance apart. The number of marks on the ruler is its order, and the largest distance between two of its marks is its length. Translation and reflection of a Golomb ruler are considered trivial, so the smallest mark ...
A ruler with two linear scales: the metric and imperial.It includes shorter minor graduations and longer major graduations. A graduation is a marking used to indicate points on a visual scale, which can be present on a container, a measuring device, or the axes of a line plot, usually one of many along a line or curve, each in the form of short line segments perpendicular to the line or curve.
For example, if a ruler's smallest mark is 0.1 cm, and 4.5 cm is read, then it is 4.5 (±0.1 cm) or 4.4 cm to 4.6 cm as to the smallest mark interval. However, in practice a measurement can usually be estimated by eye to closer than the interval between the ruler's smallest mark, e.g. in the above case it might be estimated as between 4.51 cm ...
At the bottom of page 49, the signature mark "3" represents the number of the gathering. A signature mark, in traditional bookbinding, is a letter, number or combination of either or both, which is printed at the bottom of the first page, or leaf, of a section. The section is itself referred to as a signature, also called collation or gathering ...
Hybrid measures bearing customary markings on one side and metric units on the other also exist and are sometimes referred to as yardsticks, metre-whesticks [citation needed] or "metre rulers". The spelling meter vs metre varies by country, though metre is the official and most widely used spelling in English-speaking countries.
A fine book shows no damage. Very good (VG) describes a book that is worn but untorn. For many collectors this is the minimum acceptable condition for all but the rarest items. Any defects must be noted. Good (G) describes the condition of an average used worn book that is complete. Any defects must be noted.
Insert question mark: sp: Spell out: Used to indicate that an abbreviation should be spelled out, such as in its first use stet: Let it stand: Indicates that proofreading marks should be ignored and the copy unchanged tr: transpose: Transpose the two words selected wf: Wrong font: Put text in correct font ww [3] Wrong word: Wrong word used (e.g ...