While the rodman goes downhill from the level instrument, how do the readings appear?

When a rodman moves downhill from a level instrument, the readings observed on the leveling rod will appear larger. This happens because the distance between the instrument and the rod increases as the rodman descends. In leveling surveys, the rod's elevation relative to the instrument needs to be considered.

When the rodman is positioned at a lower elevation than the instrument, the leveling instrument will register a greater reading due to the geometric principles involved in leveling. Specifically, the height of the instrument and the distance to the rod must be accounted for, which in this case results in an increase in the rod reading as the rodman moves downhill.

Understanding this principle is crucial in surveying, as accurate readings must consider the vertical relationship between the instrument and the rod at all times to ensure proper calculations are made and to assist in determining the terrain's topography accurately.