- All goniometers feature two arms attached to a fulcrum, or center. The arms adjust upward and downward to measure an angle.
- Goniometers measure angles in terms of degrees. There are 360 degrees in a full circle.
- Goniometers are often constructed from metal, like stainless steel, or from plastic. A digital type of goniometer is also available for measuring energy waves.
- Doctors use goniometers to measure the range of motion of a joint, while geologists employ goniometers to study the crystal structure of minerals, which helps to identify them. Goniometers can also measure radio waves.
- The first rudimentary goniometer was created in 1780 by Arnould Carrangeot. Eilhard Mitscherlich developed the first precision goniometer in 1843.
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