This document provides information about governors and their functions. It discusses: - Governors are speed-sensitive devices that maintain a constant engine speed regardless of load variation by regulating fuel supply. - The main functions of governors are to provide feedback to change engine speed as needed, maintain a set speed, and control engine speed by varying fuel based on load changes. - Common types of governors include centrifugal and inertia governors. Centrifugal governors use centrifugal force from rotating balls or weights, while inertia governors use the angular acceleration/retardation of flyballs. - The document then examines specific governor designs like the Watt, Porter, Proell, and Hartnell governors, discussing their components,