A lexicographic and corpus linguistic investigation of put a damper/dampener on

Some sources trace the idiom put a damper/dampener on back to either the HEAT/FIRE or the SOUND domain. Damper is said to have originally referred to either a metal plate that regulates the air supply in a chimney or a device that stops the vibration of a piano string. Diachronic corpus evidence suggests that the sense ♭something that moistens' of damper was metaphorically extended in the context of be, cast and throw and developed the meaning ♭somebody/something that depresses the spirits' based on the conceptual metaphor EMOTIONAL INTENSITY IS HEAT/FIRE. The ♭draught regulator' and ♭(piano) sound reducer' senses are more recent developments, and the variant dampener is much more recent.