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  2. Ruler - Wikipedia

    en.wikipedia.org/wiki/Ruler

    A variety of rulers A 2 m (6 ft 6 + 3 ⁄ 4 in) 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, is an instrument used to make length measurements, whereby a user estimates a length by reading from a series of markings called "rules" along an edge of the ...

  3. Scale ruler - Wikipedia

    en.wikipedia.org/wiki/Scale_ruler

    Scale ruler. 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.

  4. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    Slide rule. Typical ten-inch (25 cm) student slide rule (Pickett N902-T simplex trig) A slide rule is a hand -operated mechanical calculator consisting of slidable rulers for evaluating mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry.

  5. Tape measure - Wikipedia

    en.wikipedia.org/wiki/Tape_measure

    Diagram showing fractions of an inch on a standard sixteenth measuring tape. A tape measure or measuring tape is a flexible ruler used to measure length or distance. It consists of a ribbon of cloth, plastic, fibre glass, or metal strip with linear measurement markings. It is a common measuring tool.

  6. Hatch mark - Wikipedia

    en.wikipedia.org/wiki/Hatch_mark

    Hatch marks (also called hash marks or tick marks) are a form of mathematical notation. They are used in three ways as: Unit and value marks — as on a ruler or number line. Congruence notation in geometry — as on a geometric figure. Graphed points — as on a graph. Hatch marks are frequently used as an abbreviation of some common units of ...

  7. Graduation (scale) - Wikipedia

    en.wikipedia.org/wiki/Graduation_(scale)

    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.

  8. Thomae's function - Wikipedia

    en.wikipedia.org/wiki/Thomae's_function

    Thomae's function is a real -valued function of a real variable that can be defined as: [1]: 531. It is named after Carl Johannes Thomae, but has many other names: the popcorn function, the raindrop function, the countable cloud function, the modified Dirichlet function, the ruler function, [2] the Riemann function, or the Stars over Babylon ...

  9. Sewing gauge - Wikipedia

    en.wikipedia.org/wiki/Sewing_gauge

    Sewing gauge. 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.

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