Tuning forks model no. 921 tuning fork nickel-plated, diameter 4.5 mm/0.18", c-a2 128-880 hz. Musically standard pitch a'=440 hz 261.6 c' 277.2 cis' 293.7 d' 311.1 dis' 329.6 e' 349.2 f' 370.0 f the tuning fork is the tool used in tuning musical tones, made by utilizing the vibrations of a smooth rod. Its basis is the vibration movements created in solid bodies in the form of thin bars. Such a bar, on which transverse and longitudinal waves can be created, if it is made of a suitable metal, the vibrations of the bar can be better observed. A ratio of the frequencies of the fundamental vibration, 1st upper vibration, 2nd upper vibration…, called a bar with two free ends, 1., 2., oztitreşimlerinin, in the form of f: f2: f3:… 1: 2: 3:…, two ends of a fixed bar. Also valid. Vibrations whose frequencies have such a ratio form “harmonic vibrations”. The importance of the vibrations of the bars, which have one end fixed and the other free in practice is greater. The ratio between the frequencies of the fundamental and the upper overtones of such a bar is in the form: f3: f5:…=1: 3: 5:… Ear . Such non-harmonic (non-resonant) vibrations (response forces) die off very quickly due to air resistance, if necessary. This can be avoided to a large extent by seating the rod after bending in u shape on a fixed foot at the bending site. This obtained device is called a “tuning fork”. Both arms of a tuning fork vibrate at the same time, mutually canceling out the reaction forces that lead to the extinction of vibrations. Therefore, the damping of tuning fork vibrations is very slow. Tuning fork, specially prepared, they vibrate by hitting the tip with rubber pulls. A very small portion of the vibration energy is lost through air resistance. A good tuning fork, made by selecting a suitable metal, can vibrate for minutes and is not affected by external vibrations. Because of these features, the tuning fork vibrations that the ear detects as “sound” are used in tuning musical instruments tones. Since tuning forks with different arm lengths produce different tones, these lengths can be pre-tuned to create a tuning set that gives all the notes in an octave of a musical instrument. The first normal tuning fork, 1859’da french academy of sciences accepted 15 ° It is a tuning fork that vibrates 435 times per second at a temperature of c. However, with a modification made in 1939, the 20 ° The tuning fork, which vibrates 440 times per second at c temperature, has been recognized as the international standard tuning fork. Today, in the region of sound vibrations, electronic tuning forks are also used, from which constant frequency vibrations are obtained.
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