Protractor

A protractor (also called gauge or transporter ) is a simple goniometer for angle measurement or to submit an angle.

It consists of a circular or semi- circular disc with Angle classification. The disc may be made of plastic, thick paper or metal sheet. Are usual diameter of 8 to 15 cm and divisions of 1 ° or 0.5 °, the Survey also 0.5 Gon ( grads).

Frequently protractor are integrated in character or Geodreiecke. A triangle of Nautical cutlery is regularly equipped with a protractor. Exact angle blades have a hinged rail with scale ( wavelength division on graph ) which can be found at the desired angle.

The semi-circular carrier the millimeter graduation running along the diameter. Copies for geodesy ( the mapping is reasonable points) or for cartography have large diameter of about 30 cm. Here, the scale can also be used in most scale estimates (eg 1:500 or 1:2000, 1:1440 or 1:2880 respectively for the previous cadastral folders ). In the trades, the accurate measurement of an angle is usually unnecessary, here is for transmitting an angle to a workpiece a bevel used.

• Various protractor

Set Square with integrated protractor

Typical protractor with a small ruler for school use

400 -Gon protractor

Medical protractor

Digital protractor

Digital protractor

Parallel Motion Protractor