Protractor
The protractor is a tool used to measure angles. It usually has marks with labels of the degrees. Protractors are usually half circles or full circles.
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Protractor Media
Goniometer made by Develey le Jeune in Lausanne, late 18th–early 19th century
A half-circle protractor marked in degrees (180°).
A half-circle bevel protractor
A universal bevel protractor.
Manual (1), and Mitscherlich's optical (2) goniometers for use in crystallography, c. 1900
Surface scientists use a contact angle goniometer to measure contact angle, surface energy and surface tension.
In a contact angle measurement, the angle between the droplet and solid surface indicates the wettability of the surface.
Surface tension exists because the molecules inside a liquid experience roughly equal cohesive forces in all directions, but molecules at the surface experience larger attractive forces toward the liquid than toward gas.
A miniature electro-mechanical goniometer stage. This type of stage is used primarily in the field of lasers and optics.
Electronic protractor for quick and reliable measurement and duplication of angles - just take measurements direct from drawings and then transfer where they are needed.
