Reading of vernier bevel protractor

Reading of universel bevel protractor

For reading acute angle set up

First read the number of whole degrees between zero of the main scale and zero of  the vernier scale.

Note the line on the vernier scale that exactly coincides with any one of the main scale divisions and determine its value in minites.

To take the vernier scale reading, multiply coinciding divisions with the least count.

Example : 10×5'=50'

Total up both the reading to get the measurement =42°52'

If you read the main scale in an anticlockwise direction, read the vernier scale also in an anticlockwise direction from zero.

If you the main scale in a clockwise direction, read the vernier scale also in a clockwise direction from zero.

For obtuse angel set up

The vernier scale reading is taken on the left side as indicated by the arrow.

The reading value is substrated from 180° to get the obtuse angle value

Reading 22°30'

Measurement

180°-