Ear trumpet

Definition and stakes

Project Gutenberg,  The Gutenberg Webster's Unabridged Dictionary…

“ A funnel, or short, fiaring pipe, used as a guide or conductor, as for yarn in a knitting machine.
Ear trumpet. See under Ear. — Sea trumpet (Bot.) , a great seaweed (Ecklonia buccinalis) of the Southern Ocean. It has a long, hollow stem, enlarging upwards, which may be made into a kind of trumpet, and is used for many purposes. — Speaking trumpet, an instrument for conveying articulate sounds with increased force. — Trumpet animalcule (Zoöl.) , any infusorian belonging to Stentor and allied genera, in which the body is trumpet-shaped.
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Source: Gutenberg

Portrait of John Ayrton Paris John Ayrton Paris,  Philosophy in Sport Made Science in Earnest

“ It is evident that any sound, directed into the mouth of the trumpet, will be immediately reflected back to the orifice of the tube, and distinctly heard by a person who places his ear to the mouth of the funnel m; while the answer returned by him, travelling along the tin funnel, p p, will issue from its concealed orifice, and striking upon the concave surface of the trumpet, be returned to the ear as an echo, and thus appear as if it had proceeded from the interior of the ball. ”
Source: Gutenberg

Various,  The Atlantic Monthly, Volume 20…

“ Does the trumpet sound? A vibration of matter causes the surrounding air to vibrate in consonance with it; and the waves of air thus created, breaking against the auditory nerve, awaken a peculiar sensation which we call sound. The trumpet, vibrating variously, as the valves are moved and the air forced through it, initiates waves of air of different lengths; and as they are communicated to the surrounding air with amazing rapidity, they successively strike the listener's ear. ”
Source: Gutenberg

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