ClipArt ETC
"A trumpet-shaped instrument by which the sound of the human voice is reinforced so that it may be heard at a great distance or above other sounds, as in hailing ships at sea or giving orders at a fire. In the United States navy a speaking trumpet is the badge of the officer of the deck at sea... a, tube; b, bell; c, mouthpiece; d, rings for a band by which the trumpet may be attached to the person." —Whitney, 1889

Speaking Trumpet

"A trumpet-shaped instrument by which the sound of the human voice is reinforced so that it may be heard…