What is "enunciators"

Usage examples of "enunciators".

Passing the reef-marked entrance, the handles were pushed down on the enunciators, demanding twenty-six knots of the big Colt-Pielstick diesels.

Two cruisers and six destroyers matched her turn to port, and the handles on nine different sets of engine-room enunciators were pushed down to the FULL setting.

Two cruisers and six destroyers matched her turn to port, and the handles on nine different sets of engine-room enunciators were pushed down to the full setting.