Ruler
Variants
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==Variants== |
==Variants== |
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Rulers have long been made from different materials and in multiple sizes. Historically, they were mainly [[wood]] but [[plastics]] have also been used. They can be created with length markings instead of being [[wikt:scribe|scribed]]. Metal is also used for more durable rulers for use in the workshop; sometimes a raised metal edge is embedded into a wooden desk ruler to preserve the edge when used for straight-line cutting and to prevent ink from feathering under the ruler when used to draw a straight line with a pen. Typically {{cvt|12|in|cm|lk=on}} in length, though some can go up to 100 |
Rulers have long been made from different materials and in multiple sizes. Historically, they were mainly [[wood]] but [[plastics]] have also been used. They can be created with length markings instead of being [[wikt:scribe|scribed]]. Metal is also used for more durable rulers for use in the workshop; sometimes a raised metal edge is embedded into a wooden desk ruler to preserve the edge when used for straight-line cutting and to prevent ink from feathering under the ruler when used to draw a straight line with a pen. Typically {{cvt|12|in|cm|lk=on}} in length, though some can go up to {{cvt|100|cm|in}}, it is useful for a ruler to be on a desk or workstation to help in drawing. Shorter rulers are convenient for keeping in a pocket.[https://books.google.com/books?id=x98DAAAAMBAJ&pg=PA887 "Steel Rule Has Pocket Clip For Use As A Depth Gauge"], ''Popular Science'', December 1935, p. 887 bottom right. Longer rulers (e.g. {{cvt|18|in|cm}}) are necessary in some cases, some examples being the [[yardstick]]s and [[meter stick]]s. Historically, long [[measuring rod]]s were used for larger projects, now superseded by the [[tape measure]], [[surveyor's wheel|the surveyor's wheel]] or laser [[Rangefinding telemeter|rangefinder]]s. |
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== Use in geometry == |
== Use in geometry == |
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