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A tuning fork is an acoustic resonator in the form of a two-pronged fork with the prongs formed from a U-shaped bar of elastic metal (usually steel). It resonates at a specific constant pitch when set vibrating by striking it against a surface or with an object, and emits a pure musical tone once the high overtones fade out.
Over time, tuning forks were adapted for use in medical and therapeutic settings, where their precise frequencies have been harnessed for healing and therapeutic purposes. [3] Tuning forks are known for their nearly pure frequency response, emitting a clear, unwavering tone that is free from the complex overtones found in other instruments.
This is an iterative process in which metal is removed from certain parts of the bell to change certain harmonics. This process was made possible historically by the use of tuning forks to find sympathetic resonance on specific parts of a bell for the harmonic being tuned, but today electronic strobe tuners are normally used.
Experiment using two tuning forks oscillating at the same frequency.One of the forks is being hit with a rubberized mallet. Although the first tuning fork hasn't been hit, the other fork is visibly excited due to the oscillation caused by the periodic change in the pressure and density of the air by hitting the other fork, creating an acoustic resonance between the forks.
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Alternatively, tuning forks or other sound emitting devices are used. [ 60 ] Acupuncture point injection is the injection of various substances (such as drugs, vitamins or herbal extracts ) into acupoints. [ 61 ]
A tuning fork that belonged to Ludwig van Beethoven around 1800, now in the British Library, is pitched at A = 455.4 Hz ⓘ, well over a half-tone higher. [ 5 ] Towards the end of the 18th century there was an overall tendency for the A above middle C to be in the range of 400 ⓘ to 450 Hz. ⓘ
IEC 60689 Measurement and test methods for tuning fork quartz crystal units in the range from 10 kHz to 200 kHz and standard values IEC 60691 Thermal-links – Requirements and application guide IEC 60692 Nuclear instrumentation – Density gauges utilizing ionizing radiation – Definitions and test methods
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