Summary: Learn how to use a chalk line, make a straight line using chalk and string.
Chalk lines are used in the building industry for making straight lines on surfaces, where the accuracy is required over a long distance. Using a straightedge is the usual procedure for straight lines, but when the distance starts to become a problem, chalk lines are far easier and more accurate. A chalk line consists of a piece of string covered with chalk or some other coloured substance. When the string is stretched out marking the line needed, you simply flick the string against the surface and a marked line will appear.
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