This image shows an antique brass wye level (also known as a Y-level), which is a high-precision surveying instrument commonly manufactured from the mid-19th century through the early 20th century.Component BreakdownWye Level Telescope: The main horizontal brass tube used for sighting distant levelling rods. It rests securely in two Y-shaped supports (hence the name "wye level"), allowing the telescope to be rotated or flipped around its axis to check for calibration errors.Spirit Level: The long glass tube visible directly underneath the telescope barrel, used to establish a perfectly horizontal line of sight.Levelling Base (Tribrach): The circular brass bottom section with large thumbscrews used to level the entire instrument when mounted on a tripod.Plumb Bob: The pointed, teardrop-shaped brass weight on a string, which hangs directly below the center of the instrument to locate the exact ground position. [1]Trivet/Mounting Plate: The triangular metal piece with sharp pins used for stabilizing the leveling base on flat surfaces or wooden posts. [1]Wooden Carrying Box: The original fitted protective case used for transporting the delicate optical equipment safely.Item measures 7.5 in x 13 in x 5.5 in

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