![]() It was then called as a three-arm protractor. Meanwhile, in 1810, Joseph Huddart, a US naval commander, produced a more advanced version of a protractor created to plot a ship’s position on a nautical chart. In the early 17 th century, protractors were widely used by navigators and surveyors. However, it was written in his book that he used the protractor to create maps, particularly for nautical charts. ![]() It is unclear whether Blundeville developed the protractor. Although older instruments were used for angle measurement in addition to other mathematical pursuits, Thomas Blundeville introduced a tool specifically for measuring and constructing angles in his 1589 Briefe Description of Universal Mappes & Cardes. The use of protractors dates back over 500 years. However, some protractors are in radian or arcminute scale. More so, most protractors have 180 equal segments. They are typically made of brass, steel, wood, ivory, or plastic.Īngles are typically measured in degrees (°). Protractors can have diameters ranging from two inches to more than twelve inches. The most common protractor is a semicircle-shaped scale ranging from 0° to 180°. What is a protractor?Ī protractor is a measuring tool often made of translucent plastic or glass used to read, measure, and construct angles. With a little practice, you will soon be measuring angles with ease. Understanding that angles are parts of circles is helpful, because then the design of the protractor makes sense. There are many things to which you must pay attention. Measuring angles with a protractor can be a confusing experience.
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