Where should you always sight your plumb bob when plumbing a pole?

Sighting your plumb bob at ground level or near ground level is crucial for accurately determining if the pole is vertically aligned. This is because the reference point for vertical alignment should be consistent with the surrounding environment and is typically more stable and less subject to movement or distortion than higher points on the pole. By focusing on ground level, you ensure that any adjustments made to the pole consider the natural level of the terrain, providing a true representation of verticality.

Choosing the top or midpoint of the pole could lead to inaccuracies due to variables such as wind, pole deflection, or other external factors that may not be accounted for when measuring higher up. Sighting at the base can also present issues, especially if the ground is uneven. Therefore, ground level serves as the most reliable reference for plumbing a pole accurately.