Which part of a vernier bevel protractor is used as the reference surface while
measuring an angle?
Stock
A vernier bevel protractor is a precision angle-measuring instrument used to find the angle between two surfaces of a workpiece.
Every angle measurement needs a fixed datum surface and a movable surface, and the reading is the angle opened up between them.
The stock, also called the base or body, is the fixed part; it is rested firmly against one face of the work and acts as the reference or datum from which the angle is measured.
The blade is the movable arm that is swung and set flat against the second surface of the workpiece, so it defines the other side of the angle rather than the reference.
The vernier scale is only a reading aid; it lets you read fractions of a degree but never touches the work as a datum.
The dial or main scale likewise only displays the angular value and plays no part in referencing the workpiece.
Because the stock is the fixed face laid against the job, it is what provides the measuring reference.
Hence, the answer is Stock.
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