Name the parts of a universal bevel protractor and state the functions of each.

A universal bevel protractor is an important instrument used for measuring angles in various fields such as metrology, instrumentation, and tribology. It is designed to provide precise angular measurements and is widely used in applications like mechanical engineering, quality control, and material testing. The protractor is especially useful in measuring bevels, angles of machine parts, or other objects where accurate angle measurement is required. The instrument is versatile and consists of several parts, each serving a specific function. 

### 1. Main Scale (Base Scale):
The main scale is the stationary component of the universal bevel protractor. It is generally graduated in degrees and serves as the reference scale for measuring angles. The main scale is often divided into small increments of degrees or minutes, allowing users to take precise readings. The scale typically has graduations marked in both clockwise and counterclockwise directions, enabling the measurement of angles in either direction. The function of the main scale is to provide a direct reading of the angle when the instrument is set at the desired position. The protractor can be used for measurements ranging from 0° to 360°, depending on the design of the instrument.

### 2. Rotating Blade (Bevel Blade or Adjustable Blade):
The rotating blade, also known as the bevel blade or adjustable blade, is a movable part that __________ _____ _______ _____ ____ ____ ____ __________ _______ _________ ___.
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