Unlike woodwind instruments, which have a vibrating reed in the mouthpiece, in brass instruments a player's lips are the oscillating device that creates the note.
12.
As it is the identity of the vibrating reed ( and thus frequency ) that is of interest, rather than its amplitude, these are not calibrated.
13.
In 1769 Kratzenstein constructed resonant cavities which, when he excited them by a vibrating reed, produced the sounds of the five vowels : a, e, i, o, and u.
14.
And in principle, a virating-reed electrometer could draw no current, not even a charging current ( if the vibrating reed were placed near but not in contact with the already-charged object ).
15.
IIRC, the difference between whistling and the sound of a woodwind instrument is that the woodwind instrument has a vibrating reed that produces a range of harmonics, whereas whistling is highly filtered noise ( caused by air turbulence ).
16.
When a string is bowed or tone in a wind instrument initiated by vibrating reed or lips, a phenomenon called mode-locking counteracts the natural inharmonicity of the string or air column and causes the overtones to lock precisely onto integer multiples of the fundamental pitch, even though these are slightly different from the natural resonance points of the instrument.
