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Similar to functions of a yard stick in the States. It can be used for measurement, obviously; the smallest units are usually millimetres. It can also be used just to draw a straight line, especially on a large surface such as a chalkboard or white board. Generally, it is either too large - for measurement on a piece of paper, for example, too inaccurate - lines are printed on wood, or too short - for measuring a room, height of a wall, and so on. In schools, it can also be used as a pointer or as a device to get students' attention: it makes a resounding "Whack!" on a desk.

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13y ago

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