When one slip gauge is placed over another, some air gap is present in between them. This air gap will affect the accuracy of the measurement. So we need to avoid this air gap. The process of removal of air is called wringing.
Procedure for wringing
i)
Clean the slip
gauge with lint free cloth or cleansing tissue.
ii)
Move one slip
slightly over the other with light pressure.
iii)
One gauge is
place over the other 90o and then it is turned until the gauges
align in one line.
The gauges are adhere together. Adhesion is due to molecular attraction and
atmospheric pressure.
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