tuning fork

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tuning fork,

steel instrument in the shape of a U with a short handle. When struck it produces an almost pure tone, retaining its pitch over a long period of time; thus it is a valuable aid in tuning musical instruments. It was invented in 1711 by John Shore, who jokingly called it a pitchfork.

Tuning fork

A steel instrument consisting of two prongs and a handle which, when struck, emits a tone of fixed pitch. Because of their simple mechanical structure, purity of tone, and constant frequency, tuning forks are widely used as standards of frequency in musical acoustics. In its electrically driven form, a tuning fork serves to control electric circuits by producing frequency standards of high accuracy and stability. A tuning fork is essentially a transverse vibrator (see illustration). See Vibration

A tuning fork vibrating at its fundamental frequencyenlarge picture
A tuning fork vibrating at its fundamental frequency

Tuning Fork


a source of sound, consisting of a metal rod that is bent and fixed in the center. The ends of the rod can vibrate freely. During the tuning of musical instruments, the tuning fork serves as the standard pitch of a tone; it is also used to give the pitch in singing. Forks that produce the tone A’ (A of the first octave) are usually used. Singers and choral conductors also use forks producing the tone C”. There are chromatic tuning forks, with prongs that have movable little weights. Depending on the position of these weights, the prongs vibrate at different frequencies.

The tuning fork was invented by the English musician J. Shore in 1711. At that time the standard frequency of vibrations for the tone A’ was 419.9 hertz (Hz). In the late 18th century the composer and conductor G. Sarti, who was working in St. Petersburg, introduced the “St. Petersburg tuning fork,” with an A’ = 436 Hz. In 1858 the Paris Academy of Sciences proposed a standard pitch tuning fork with A’ = 435 Hz. In 1885 at an international conference in Vienna this frequency was adopted as the international standard pitch for the tone A’; the frequency was called the standard musical pitch. Since Jan. 1, 1936, an all-Union standard pitch of A’ = 440 Hz has been in effect in the USSR.


MuzykaVnaia akustika. Edited by N. A. Garbuzov. Moscow-Leningrad, 1940.

tuning fork

[′tün·iŋ ‚fȯrk]
A U-shaped bar for hard steel, fused quartz, or other elastic material that vibrates at a definite natural frequency when struck or when set in motion by electromagnetic means; used as a frequency standard.

tuning fork

a two-pronged metal fork that when struck produces a pure note of constant specified pitch. It is used to tune musical instruments and in acoustics
References in periodicals archive ?
Imaging soft samples in liquid with tuning fork based shear force microscopy.
Distance control for a near-field scanning microwave microscope in liquid using a quartz tuning fork.
2 for TF1 as well as data (not shown) for the other tuning forks.
TF,0] are unique for each tuning fork and, for the tuning forks examined here, these values are given in Table 1.
At this point in the physical examination the tuning fork test was performed.
Gently strike a tuning fork with a rubber mallet, then touch the handle only to various objects.
Sending electricity to the gyroscope, at between 0 and 5 volts, generates electrostatic forces that cause vibration in two separate comb-drive tuning forks, which are called proof masses.
In addition, Miyota is the leading worldwide supplier of miniature quartz tuning forks used in watches and clocks.
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Other developments occurred in the vibrating level sensors such as tuning forks.