What is a dumpy level and what are its parts?

A dumpy level is a commonly used leveling instrument where the telescope is rigidly fixed to the vertical spindle. Main parts include: telescope (for sighting with magnification 15-25x), bubble tube (for leveling the line of sight), tribrach (supports the level head), foot screws (for leveling adjustment), and tripod (supports the instrument). The instrument is leveled using foot screws until the bubble is centered. It provides consistent accuracy and is suitable for ordinary leveling work in construction.