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A diagonal scale requires the construction of

  • A.a vernier plate sliding against a main scale
  • B.eleven parallel lines cut by a diagonal
  • C.two parallel lines joined by a single diagonal
  • D.a semicircle divided into equal arcs

Answer: B

Correct answer: eleven parallel lines cut by a diagonal

Eleven equally spaced parallels give ten intervals, so the diagonal is divided into ten equal parts and each parallel yields a successive tenth of the smallest base division. That is what gives the diagonal scale its third significant figure, and the same construction extended gives finer divisions still.

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