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Which of the following is used to test straightness of bed in the transverse direction of long beds?

Which of the following is used to test straightness of bed in the transverse direction of long beds? Correct Answer Spirit level

In longitudinal direction, the test for straightness for the long beds can be determined by taut wire method, autocollimator, straight edge etc but in transverse direction it can be carried out only by using spirit level.

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