
Since the advent of laser levels it's been easy to mark create guide lines over long distances. Because a laser doesn't lose its accuracy (or not so we as builders would be bothered) it's possible for one person to mark out lines on their own.
However what if you had to mark a line or a series of lines quickly and accurately so that they are all visible at the same time?
There's one little but very seldom talked about tool I love and wouldn't be without and that's a chalk line.
A chalk line allows a single person (although it's easier with two people) to mark a line on materials such as concrete, plasterboard, wood and even metal (in fact any material with a surface that powdered chalk is able to cling to) before cutting, drilling or marking a straight line.
How a chalk line works
The concept is simple. A fine string is coiled up inside (see fig 1.) a reservoir where finely ground dry chalk powder is stored. As the string is pulled out of the reservoir it retains chalk powder along its length and when held taught over a distance and pinged (or snapped as some refer to it) the chalk is jettisoned onto the surface where you want to leave a mark.
Chalk lines can be as long as 50 metres.
Figure 1. What a chalk line looks like (the winding handle can be closed, just like a wind up tape measure
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