In the same manner as that just described the sound of trumpets can be
produced. Insert into a carefully closed vessel the tube of a funnel
reaching nearly to the bottom and soldered into the surface of the
vessel; and, by its side, a trumpet, provided both with a mouthpiece
and bell, and communicating at its upper extremity with the vessel.
If water be poured through the funnel, it will be found that the
air contained in the vessel, as it is being driven out through the
mouthpiece, will produce the sound of a trumpet.