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  2. Tuning fork - Wikipedia

    en.wikipedia.org/wiki/Tuning_fork

    A tuning fork is a fork-shaped acoustic resonator used in many applications to produce a fixed tone. The main reason for using the fork shape is that, unlike many other types of resonators, it produces a very pure tone, with most of the vibrational energy at the fundamental frequency. The reason for this is that the frequency of the first ...

  3. Piano tuning - Wikipedia

    en.wikipedia.org/wiki/Piano_tuning

    An A440 tuning fork A common method of tuning the piano begins with tuning all the notes in the "temperament" octave in the lower middle range of the piano, usually F3 to F4. A tuner starts by using an external reference, usually an A440 tuning fork , (or commonly a C523.23 tuning fork) to tune a beginning pitch, and then tunes the other notes ...

  4. Vibrating structure gyroscope - Wikipedia

    en.wikipedia.org/wiki/Vibrating_structure_gyroscope

    Vibrating structure gyroscope. A vibrating structure gyroscope (VSG), defined by the IEEE as a Coriolis vibratory gyroscope ( CVG ), [ 1] is a gyroscope that uses a vibrating structure to determine the rate of rotation. A vibrating structure gyroscope functions much like the halteres of flies ( insects in the order Diptera ).

  5. Musical tuning - Wikipedia

    en.wikipedia.org/wiki/Musical_tuning

    Man turning tuning pegs to tune guitar Tuning of Sébastien Érard harp using Korg OT-120 Wide 8 Octave Orchestral Digital Tuner. Tuning is the process of adjusting the pitch of one or many tones from musical instruments to establish typical intervals between these tones. Tuning is usually based on a fixed reference, such as A = 440 Hz.

  6. Hubble sequence - Wikipedia

    en.wikipedia.org/wiki/Hubble_sequence

    At the centre of the Hubble tuning fork, where the two spiral-galaxy branches and the elliptical branch join, lies an intermediate class of galaxies known as lenticulars and given the symbol S0. These galaxies consist of a bright central bulge , similar in appearance to an elliptical galaxy , surrounded by an extended, disk -like structure.

  7. Crystal oscillator - Wikipedia

    en.wikipedia.org/wiki/Crystal_oscillator

    XY, tuning fork: 3 – 85 kHz length-width flexure The dominant low-frequency crystal, as it is smaller than other low-frequency cuts, less expensive, has low impedance and low ⁠ C 0 / C 1 ⁠ ratio. The chief application is the 32.768 kHz RTC crystal. Its second overtone is about six times the fundamental frequency. [49] H: 8 – 130 kHz

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