Original tuning fork is also a sound generator, looking similar to the crystal tuning fork, also with "Y" shaped, but made of steel or aluminum alloy, not fused quartz. It could make pure tone of different frequencies due to its different quality, fork length and thickness. The original tuning fork was invented in 1711 by the Englishman John Scholl who is a lute performer. The Lute is very difficult to tune, so he invented tuning fork to help it tuning. Usually, the sound of the tuning fork is weak and sometimes you have to put the fork close to ear to hear clearly. For this reason, the tuning fork is sometimes pressed on a solid surface such as a table after knocking, which makes the flat panel resonate and greatly increases the volume. And the greater the amplitude of vibration is, the louder of the sound will be.
Just like crystal tuning fork, the original one is also widely used in many areas. In class, the original tuning fork is used by teacher to show resonance phenomenon. In industry, it is used as a level meter, that is, a switch that controls the level of a substance. Using tuning fork to take the standard tone is one of the most important parts of the piano tuning process. It relates to the pitch of each key in a piano. In many keyboard instruments such as electric piano, there is an element similar to the tuning fork. It is a simple and reliable method to distinguish the property of deafness, conductive deafness or nerve deafness, with the tuning fork. The tuning fork is also used as a therapeutic tool in some special therapies of which the most important one is the sound healing therapy.