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Explain a method to find the thickness of a hollow tea cup.
 
To find the thickness of a hollow teacup,
  • Determine the pitch, the least count and the zero error of the screw gauge.
Pitch:
 
 
Least count:
 
\(Least count\ (LC)\ =\)  \(mm\)
 
Zero error:
\(Positive\ zero\ error\ (ZE)\ =\) 
\(=\)
 
So, \(Zero\ correction\ (ZC)\ =\)
 
\(Negative\ zero\ error\ (ZE)\ =\)
 
So, \(Zero\ correction\ (ZC)\ =\) 
  • Place the teacup between the two studs.
  • Rotate the head until the teacup is held firmly but not tightly, with the help of the ratchat.
  • Observe the reading of the pitch scale crossed by the head scale (PSR) and the head scale division that coincides with the pitch scale axis (HSC).
  • The thickness of the teacup is given by . Repeat the experiment for different positions of the teacup.
  • Tabulate the readings.
  • The average of the last column readings gives the thickness of the teacup.