How should an elevator constructor check the well hole depth?

Checking the well hole depth accurately is crucial for elevator construction, as it ensures that the elevator components are properly fitted and function safely. The method of dropping a weight on a line to the bottom and measuring the line provides a direct and precise measurement of the depth. This approach eliminates potential errors that might arise from other methods, such as variations in the surface conditions or reading angles.

Using a weight ensures that the line is vertical and reaches the very bottom of the well hole, allowing for a reliable measurement without any obstruction or misalignment that could occur with other methods. This technique also helps to account for any irregularities within the well hole itself, providing the most accurate representation of its true depth.

In contrast, utilizing a laser level or a tape measure from the top could introduce inaccuracies due to perspective issues or measurements taken at angles. Installing a measuring stick could also present challenges, such as securing it in place and ensuring it remains undisturbed during the measurement process. Thus, dropping a weight on a line remains the best practice for determining well hole depth effectively.