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Correct Answer: (C)
control shaft
Explanation: a special control shaft is used to check this where a right angled blade is provided at right angle to shaft diameter line. the ocular line is made to coincide with the blade and the column is titled, the shift in position of the ocular line is noted, this shift is the required error.
Explanation by: Mr. Dubey
a special control shaft is used to check this where a right angled blade is provided at right angle to shaft diameter line. the ocular line is made to coincide with the blade and the column is titled, the shift in position of the ocular line is noted, this shift is the required error.
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Mr. Dubey
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