Close Wiki Loves Monuments: Photograph a Monument, Help Wikipedia and Win! Ruler from Wikipedia, the Free Encyclopedia for Other Uses, See Ruler (Disambiguation)
Close Wiki Loves Monuments: Photograph a monument, help Wikipedia and win! Ruler From Wikipedia, the free encyclopedia For other uses, see Ruler (disambiguation). A variety of rulers A 2-meter carpenter's rule Retractable flexible rule or tape measure A closeup of a steel rule A ruler, sometimes called a rule or line gauge, is an instrument used in geometr y, technical drawing, printing as well as engineering and building to measure di stances or to rule straight lines. The ruler is a straightedge which may also co ntain calibrated lines to measure distances.[1] Contents [hide] 1 Types 2 Ruler applications in geometry 3 History 4 Curved and flexible rulers 5 Philosophy 6 Sticking to the Ruler's Marks 7 See also 8 References 9 Bibliography 10 External links Types[edit source | editbeta] Rulers have long been made of many materials in a wide range of sizes. Some are wooden. Plastics have also been used since they were invented; they can be molde d with length markings instead of being scribed. Metal is used for more durable rulers for use in the workshop; sometimes a metal edge is embedded into a wooden desk ruler to preserve the edge when used for straight-line cutting. 12 inches or 30 cm in length is useful for a ruler to be kept on a desk to help in drawing . Shorter rulers are convenient for keeping in a pocket.[2] Longer rulers, e.g., 18 inches (45 cm) are necessary in some cases. Rigid wooden or plastic yardstic ks, 1 yard long and meter sticks, 1 meter long, are also used.
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