Discussion
What is the least count of a vernier bevel protractor?
Answer: B
The least count of a vernier bevel protractor is 5’ (five minutes).
The main scale is graduated in degrees, and the vernier has 12 divisions on each side of its zero, spanning 23 degrees. One vernier division is therefore 23/12 degrees, or 1 degree 55 minutes, which falls short of two main-scale degrees by 5 minutes of arc.
1’ and 0.5’ would need a far finer vernier than a bevel protractor carries, and 10’ is twice the actual least count.
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