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What are Protractors?

Protractors are used to directly measure angular surfaces. The tools most commonly used are the simple protractor, the protractor head, and the universal bevel protractor.

Simple protractor. A simple protractor consist of a rectangular; head graduated un degrees along a semicircle with a blade pivoted on the center pin. By rotating the blade on the center pin, any angle from 0 to 180°can be set.

Protractor head. The protractor dead is one of several tools on the combination square. It has revoling turrets with direct-reading double graduations a full 0-180°in opposite directions. This permits direct reading of angles above or below the blade.

Universal bevel protractor. The universial bevel protractor consists of a round body with a fixed blade on which a graduated protractor dial rotates. The turret is xlotted to accommodate a 7 or 12?180 or 300mm) nongraduated blade. The blade and dial may be rotated as a unit to any desired position and locked in place by means of the dial clamp nut. The blade may also be independently extended in either direction from the protractor.

 

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