In a screw gauge, the zero of the circular scale lies 3 divisions above the horizontal pitch line when their metallic studs are brought in contact. Using this instrument thickness of a sheet is measured. If pitch scale reading is 1 mm and the circular scale reading is 51 then the correct thickness of the sheet is 
mm. [Assume least count is 0.01 mm]
Text Solution
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For a screw gauge, the measurement formula is: Reading 
Pitch scale + (Circular scale × Least count) - Zero error
The zero of circular scale lies 3 divisions above the pitch line, indicating negative zero error:
Zero error 
Reading 
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