Intro to Millwright Practice Exam 2026 - Free Millwright Skills Practice Questions and Study Guide

A plumb bob is designed specifically to transfer points vertically from one elevation to another. It consists of a weight suspended from a string, which does not move and thus directly shows the vertical line from its point of suspension down to its point of contact with a surface below. When you hang a plumb bob from a height, it will always point directly to the earth due to gravity, allowing you to accurately mark a point directly below the point of suspension, effectively transferring the elevation.

In contrast, while a level is used to determine horizontal surfaces and can help in leveling work between two points, it does not directly transfer vertical points. A chalk line is useful for marking long straight lines on flat surfaces but does not provide vertical reference points. A caliper is primarily used for measuring the dimensions of objects and is not intended for transferring elevation marks.