In an automatic level, the compensator uses what to maintain a true level line of sight?

In an automatic level, the compensator uses what to maintain a true level line of sight?

• A. Friction
• B. Air Pressure
• C. Gravity
• D. Magnetism

Answer: (C)

Gravity provides the restoring force that keeps the line of sight level. Inside the compensator, a suspended mass or pendulum is pulled to a vertical orientation by gravity. If the instrument tilts, this gravity-driven element moves back toward vertical, nudging the telescope back to a true horizontal. A locking mechanism then holds it in place so the sight line stays level. Friction, air pressure, or magnetism don’t actively restore a true level in this system—the key action is gravity turning the compensator back to its level position.

Gravity provides the restoring force that keeps the line of sight level. Inside the compensator, a suspended mass or pendulum is pulled to a vertical orientation by gravity. If the instrument tilts, this gravity-driven element moves back toward vertical, nudging the telescope back to a true horizontal. A locking mechanism then holds it in place so the sight line stays level. Friction, air pressure, or magnetism don’t actively restore a true level in this system—the key action is gravity turning the compensator back to its level position.