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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]
The ancient Indian sexual treatise Kama Sutra, originally written in Sanskrit, probably between the second and fourth centuries AD, divides men into three classes based on penis size: "hare" size (about 5–7 cm, or 2–3 inches, when erect), "bull" size (10–15 cm, or 4–6 inches), and "horse" size (18–20 cm, or 7–8 inches). [67]
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.
A scale ruler is a tool for measuring lengths and transferring measurements at a fixed ratio of length; two common examples are an architect's scale and engineer's scale. In scientific and engineering terminology, a device to measure linear distance and create proportional linear measurements is called a scale.
Two wooden yardsticks with brass ends, in inches and division of yard for half, quarter, eighth and sixteenth A folding metre-stick carpenter's ruler with millimetre divisions and numbers in centimetres. Fully extended it measures 2 metres. In countries in which the metric system is used, the scale typically contains only a metric scale.
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A sewing gauge is a ruler, typically 6 inches long, used for measuring short spaces. It is typically a metal scale, marked in both inches and centimeters with a sliding pointer, similar in use to a caliper. It is used to mark hems for alterations as well as intervals between pleats and buttonholes and buttonhole lengths. It can be also used as ...
The first proposal to tie an SI base unit to an experimental standard independent of fiat was by Charles Sanders Peirce (1839–1914), [6] who proposed to define the metre in terms of the wavelength of a spectral line. [7] This directly influenced the Michelson–Morley experiment; Michelson and Morley cite Peirce, and improve on his method. [8]