The document summarizes the instruments used in land surveying and leveling. It describes the main components of a dumpy level, including the tripod stand, leveling head, foot screws, telescope, bubble tubes, and staff. It also discusses the different types of leveling staffs, including solid staffs, telescopic staffs, and folding staffs. The overall aim of leveling is to determine the relative heights of points on the ground surface and measure elevation changes.