How is the Plumb tool used by Operative Masons?

The Plumb tool is primarily used by Operative Masons to ensure that structures are vertical and true to the perpendicular. This aligns with the practice of achieving straight vertical lines in construction, which is essential for the stability and aesthetic of the final structure. When a mason uses a Plumb, they hang a weight from a string, allowing gravity to determine the exact vertical line. This precision is crucial for tasks such as setting walls and columns as it guarantees that these elements are properly aligned. The other choices relate to different tools and techniques; leveling work typically involves a level, squaring corners is done with a square, and measuring distances requires a measuring tape or equivalent tool. Thus, the Plumb tool's unique function focuses on establishing vertical accuracy, which is why it is associated with raising perpendiculars.