speaking trumpet

a trumpet-shaped instrument used to carry the voice a great distance or held to the ear by a deaf person to aid his hearing

Words nearby speaking trumpet

A speaking-trumpet from the vessel replies: "Keep away or you'll be fired on!"

The Origins of Contemporary France, Volume 4 (of 6) |Hippolyte A. Taine
Sir Samuel was the inventor of the speaking-trumpet, and also greatly improved the capstan and other instruments.

Hammersmith, Fulham and Putney |Geraldine Edith Mitton
Truxton mounted the rail, and shouted through a speaking-trumpet, "What ship is that?"

The Naval History of the United States |Willis J. Abbot.
He looked after his men through a telescope, and gave orders with a speaking-trumpet.

Springtime and Other Essays |Francis Darwin

The speaking-trumpet is also another and familiar example of the same principle.

The Boy's Playbook of Science |John Henry Pepper