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Which of the following method use pendulum in measuring the surface finish?

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Which of the following method use pendulum in measuring the surface finish?

(a) Micro interferometer

(b) Wallace surface dynamometer

(c) Reflected light intensity method

(d) Microscopic inspection

I had been asked this question by my school teacher while I was bunking the class.

Enquiry is from Methods of Measuring Surface Finish in division Measurement of Surface Finish of Engineering Metrology

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Correct option is (b) Wallace surface dynamometer

The best explanation: Wallace surface dynamo meter is like a friction meter which consists a pendulum in which the testing shoes are present which are clamped to a bearing surface and a spring pressure which is predetermined can be applied.

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