Least count of Vernier bevel protector is _______.

Explanation:

Vernier bevel protractor:

• The vernier bevel protractor is a precision instrument meant for measuring angles to an accuracy of 5 minutes (5').

Parts of a vernier bevel protractor:

Stock:

• This is one of the contacting surfaces during the measurement of an angle.
• Preferably it should be kept in contact with the datum surface from which the angle is measured.

Dial:

• The dial is an integrated part of the stock. It is circular in shape, and the edge is graduated in degrees.

Blade:

• This is the other surface of the instrument that contacts the work during measurement.
• It is fixed to the dial with the help of the clamping lever.
• A parallel groove is provided in the center of the blade to enable it to be longitudinally positioned whenever necessary.

Locking screws:

• Two knurled locking screws are provided, one to lock the dial to the disc, and the other to lock the blade to the dial.

Uses of a vernier bevel protractor:

• Apart from being used for measuring angles a vernier bevel protractor is also used for setting work-holding devices on machine tools, work tables, etc.
• The vernier bevel protractor is used to measure acute angles less than 90º obtuse angles more than 90º.
• For setting work-holding devices to angles on machine tools, work tables, etc.