What is a rule used for?
What is a rule used for? |
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Rules are commonly used to assist with marking, cutting or scoring straight lines, or measuring across flat distances. There are also special purpose rules, with different features or markings, which can be used for specific tasks.
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Measuring |
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The long, straight edges on rules have gradation marks which represent standard units of measurement. Separate rules can have different markings, depending on their purpose. A good quality rule will be as accurate as its smallest gradation: commonly this will be a millimetre or 1/16th inch. | |||
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Rules are generally rigid instruments, which makes them ideal for taking linear measurements on straight surfaces. Although some rules are flexible, they should still be able to be laid out flat.
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Some rules have features which allow them to be used with a protractor to determine angles which can’t easily be measured with just a protractor.
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Drawing, cutting or scoring straight lines |
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The long straight edge of a rule can also be used to create straight lines, as long as the edge is not damaged or bent. Drawing or cutting implements can be guided along this straight edge to create a line on a surface.
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