Translations:Adventist Youth Honors Answer Book/Vocational/Masonry/4/en
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2. Demonstrate ability to use properly the following:
Plumb line
A plumb line is a string with a plumb bob at the end of it. The plumb bob hangs straight down, so the plumb line can be used to make sure that a wall is perfectly vertical and does not lean in any direction. A perfectly vertical line is said to be plumb.
